DECODING: Russian technology transfers to Pyongyang — submarines, air defense, and electronic warfare

DECODING: Russian technology transfers to Pyongyang — submarines, air defense, and electronic warfare

Introduction: the axis of aggressors acquires a technological memory

A military partnership changing in nature

Since the start of Russia's full-scale invasion of Ukraine in February 2022, the world has learned to document the arms flows between Moscow and Pyongyang. Millions of artillery shells, short-range ballistic missiles, tens of thousands of North Korean soldiers — the list of Kim Jong-un's military contributions to Vladimir Putin's war machine is now well documented. But what the world understands far less clearly is what Putin gives in return. And that is where the real danger begins.

An analysis published on June 25, 2026 by the Foundation for Defense of Democracies (FDD) — an American national security research organization — reveals the full scope of Russian technology transfers to North Korea. This is not just money. Not just food. It is cutting-edge military technology: submarine propulsion, air defense systems, electronic warfare. North Korea is no longer merely a nuclear pariah state. It is becoming a nuclear pariah state with conventional military capabilities undergoing rapid modernization — thanks to Ukrainian blood.

The second anniversary of the mutual defense treaty

On June 19, 2026, the world marked the second anniversary of the Russia-North Korea comprehensive strategic partnership treaty, signed during Putin's visit to Pyongyang in June 2024. This treaty contains a mutual defense clause — if one of the two countries is attacked, the other must intervene militarily. Over two years, this treaty has transformed an opportunistic relationship into a structured alliance. It legitimized the deployment of tens of thousands of North Korean soldiers on Russian soil, and it opened the door to the technological transfers that observers are now documenting with growing alarm.

This anniversary date is anything but incidental. Kim Jong-un used the ceremonies of the Second Plenary Session of the Ninth Central Committee of the Korean Workers' Party in June 2026 to announce his ambition to "surpass the world" in military capabilities. An ambition that, without Russian technology transfers, would have rung hollow. With them, it takes on a deeply troubling substance.

Submarine propulsion: the crown jewel of technology transfers

Reactor modules aboard a sunken vessel

The affair first made headlines in December 2024, when the Ursa Major — a vessel belonging to the Russian Defense Ministry's main transport contractor — sank off the Spanish coast. Spanish media reported that the ship was carrying cooling and steam piping components for two Russian VM-4SG nuclear reactors destined for Rason, in North Korea. The accidental sinking thus revealed what Moscow had been careful not to announce.

In September 2025, South Korean intelligence services confirmed they were investigating reports that Russia had provided North Korea with two to three modules required for nuclear submarine propulsion — potentially including an operational reactor, steam turbines, and cooling systems salvaged from decommissioned Russian submarines. Seoul's National Intelligence Service (NIS) stated it was working to verify this information. The ISW documented these transfers in its Korean Peninsula updates.

What this would change for the Pacific balance

If North Korea acquires an operational nuclear submarine propulsion capability, the strategic consequences are considerable. A conventional diesel-electric submarine must surface regularly to recharge its batteries — making it vulnerable. A nuclear-powered submarine can stay submerged for weeks, even months. It becomes a practically undetectable ballistic missile launch platform. For North Korea, whose entire strategy rests on nuclear deterrence, this would be an absolute paradigm shift.

South Korea and Japan immediately intensified their efforts to develop their own nuclear-powered submarines in response. Trump supported this effort at his summit with the South Korean president in October 2025. Meanwhile, Russia officially protested against the South Korean nuclear submarine program while continuing to supply the North Korean one. The logic of double standards is absolutely explicit — and equally scandalous.

The Pantsir-M spotted on a North Korean destroyer

A Russian air defense system identified aboard one of Kim's warships

The FDD analysis of June 25, 2026 mentions a detail that deserves particular attention: an air defense system spotted on a North Korean destroyer that closely resembles a Pantsir-M — the naval version of the famous Russian-Soviet Pantsir-S1 system. This short-to-medium-range system, combining automatic cannons and surface-to-air missiles, is one of the pillars of Russian air defense.

If this identification is confirmed, it represents a very significant technology transfer. The Pantsir-M is specifically designed to defend surface vessels against drones, cruise missiles, and low-altitude aircraft. That is precisely the type of capability the North Korean navy lacks — and one that Ukraine itself learned to exploit with its maritime drones in the Black Sea. Russia is transferring to North Korea the exact systems whose value it learned to appreciate when fighting against Ukraine.

The 360-degree warfare Kim is building

Nuclear submarines, surface air defense, improved ballistic missiles — the overall picture taking shape is that of a North Korean military being repackaged for modern 360-degree warfare. Kim is not building an army to parade through Pyongyang. He is building an army capable of threatening simultaneously at sea, in the air, and on land.

South Korea's commander in chief has also mentioned the 500,000 young Koreans that Kim's regime is planning to train as "drone warriors" — a large-scale force of combat drone operators. Combined with the lessons of the war in Ukraine that North Korean soldiers brought back with them, this represents an emerging military doctrine that Seoul, Tokyo, and Washington cannot afford to ignore.

Electronic warfare: the invisible weapon being transferred

Jamming, blinding, paralyzing

Beyond the visible equipment, the FDD documents transfers in the domain of electronic warfare — the art of jamming enemy communications, blinding radars, disrupting navigation and guidance systems. Russia has developed some of the world's most sophisticated electronic warfare capabilities, and it has massively tested them in Ukraine. These systems have caused real problems for Ukrainian drones, NATO communications, and GPS systems.

The transfer of this expertise to North Korea is particularly alarming. The Korean Peninsula is already a theater of regular GPS disruptions — North Korea frequently launches jamming operations targeting South Korea. But if it acquires Russia's next-generation capabilities tested in Ukraine, those disruptions could graduate from a nuisance to a genuinely paralyzing weapon in any open conflict scenario.

America's advantage in East Asia called into question

The US Indo-Pacific Command (INDOPACOM) built its doctrine of superiority on several pillars: air supremacy, intelligence superiority, invulnerable communications networks, precision guidance. If North Korea acquires robust electronic warfare capabilities — which it will inevitably share with China, which observes, analyzes, and absorbs everything — it is this entire doctrine of superiority that is being challenged.

American defense analysts acknowledge it: Washington's military technological advantages in East Asia are eroding. Not dramatically, not overnight, but progressively, inexorably. Russia is accelerating this erosion by supplying its allies with the tools forged in Ukrainian trenches. Ukraine is paying the price of this war with its blood — and the Pacific inherits the strategic consequences.

The improved KN-23: the deadly feedback loop

From Pyongyang to Kharkiv and back

The military feedback loop between Russia and North Korea may be the most alarming aspect documented by the FDD. North Korea initially sent its KN-23 missiles (short-range ballistic missiles, the North Korean version of Russia's Iskander) to Russia to use against Ukraine. Russia used them. But it also analyzed their performance, identified their weaknesses, and implemented technical improvements. It then shared those improvements with Pyongyang.

The result: the precision and survivability of the KN-23 have increased. The North Korean missile is now more accurate and harder to intercept than it was before the war in Ukraine. This cycle of improvement under real combat conditions is exactly what Western armies do — but democracies do it in exercises. Kim does it by testing his missiles on Ukrainian civilians. It is a method of optimization that is simultaneously profoundly immoral and technically effective.

The 12 million shells and Kim's war economy

North Korea had supplied Russia, according to the Council on Foreign Relations, with some 12 million 152mm artillery shells by July 2025 — an astronomical quantity that sustained the intensity of Russian fire for months. These shells are not gifts. They are paid for — in financial assets, in energy, in food, but above all in technology.

Kim has thus transformed his country into the main arsenal for Russia's war in Europe. It is an extraordinarily lucrative strategic position: North Korea empties its shell stockpiles — which it can replenish — and receives in exchange technology it could never develop on its own due to international sanctions. This is a perfectly rational transaction for Pyongyang. And a catastrophic transaction for global security.

The North Korean soldiers: back from the Ukrainian hell with new skills

Six thousand dead and a transformed army

The figures are brutal. According to reports compiled from various Ukrainian and South Korean sources, approximately 2,300 to 6,000 North Korean soldiers were killed in combat in Russia, a large proportion of them in the Kursk region during the Ukrainian incursion. An estimated 10,000 to 12,000 North Korean soldiers were deployed to Russia — figures cited by President Volodymyr Zelensky himself.

But the survivors did not come back empty-handed. South Korea's NIS explicitly stated that North Korean soldiers who fought in Ukraine had "acquired modern combat tactics, techniques, and procedures" as well as "battlefield data." Soldiers who learned to operate under drone fire, to use modern trench warfare, to understand Russian command and control systems. They return to Pyongyang as living instructors.

North Korean prisoners and Seoul's dilemma

South Korea confirmed it agreed to take in North Korean prisoners of war captured by Ukrainian forces. This is a politically sensitive but strategically invaluable decision: these captured soldiers are a first-rate intelligence source on the state of the North Korean military, the Russian systems they handled, and the doctrines they were taught. Russia officially protested this South Korean initiative, fearing the revelations these soldiers might make.

The mere fact that Moscow protests the repatriation of North Korean prisoners to Seoul is revealing. It confirms that North Korean soldiers saw, heard, and handled enough for their testimony to be dangerous to Russia. It is not for nothing that Kim Jong-un himself confirmed that some of his soldiers had chosen self-detonation with a grenade rather than allow themselves to be captured. An indication of the orders they received — and the value of the information they carried.

The book "Axis of Aggressors": naming the alliance to better combat it

The FDD names what others hesitate to name

The Foundation for Defense of Democracies published a book titled Axis of Aggressors that documents in detail the strategic coherence between Russia, North Korea, Iran, and China. This book — and the June 25 analysis derived from it — does something intellectually important: it refuses to treat these relationships as opportunistic or temporary alliances, and instead analyzes them as a coherent system of contestation against the Western world order.

This naming matters. Calling something by its name is the first step in combating it effectively. The West long hesitated to speak of an "axis" for fear of appearing to demonize entire nations. But this rhetorical caution contributed to a systematic underestimation of the coherence of these alliances. Russia supplies technology to North Korea. Iran supplies drones to Russia. China buys sanctioned Russian oil. This is not coincidence. It is a system.

What this axis means for NATO and its Pacific allies

The strategic implication is that the theaters of operation — Europe, the Middle East, the Indo-Pacific — are not separate. They are interconnected by the same actors contesting them simultaneously. North Korea's military buildup is as much a threat to American allies in Asia as the Iranian military rise is to Israel and the Gulf. These challenges must be addressed as facets of a single systemic problem, not as distinct crises to be managed sequentially.

NATO allies, at the The Hague summit in June 2026, discussed increasing defense spending. But the stakes go beyond GDP percentages. The point is to understand that supporting Ukraine is not merely a Ukrainian issue — it is also about containing the acquisition of Russian military technology by Pyongyang. Every Ukrainian missile that destroys a Russian tank is one less tank Russia can spend on technology transfers to Kim.

The mutual defense treaty and its legal implications

A mutual assistance clause that compels escalation

The June 2024 Russia-North Korea treaty contains an automatic mutual military assistance clause in the event of an armed attack against either country. This clause is technically similar to NATO's Article 5. It means that if the United States or South Korea were to strike North Korea militarily — in response to a provocation, for instance — Russia would theoretically be obligated to intervene.

This scenario remains hypothetical, but it is no longer merely theoretical. Russia and North Korea have institutionalized their defensive alliance. During Russian Defense Minister Andrei Belousov's visit to Pyongyang in April 2026, the two countries agreed to put their military cooperation on a "stable and long-term" footing, with a cooperation plan for the 2027-2031 period being prepared. This is no longer an alliance of circumstance — it is a structural alliance.

The lessons of Kursk for the Korean Peninsula

Ukraine's incursion into the Kursk region in the summer of 2024 was, for North Korea, an unexpected military laboratory. Its soldiers learned to defend territory against a modern combined arms-drones-precision artillery offensive. Those lessons — how to defend positions under FPV drone attack, how to coordinate mobile air defense and infantry, how to manage communications under electronic warfare — are directly applicable on the Korean Peninsula.

Russia officially thanked North Korea for its participation in the "liberation of Kursk" — the State Duma speaker personally expressed gratitude to Kim. This public recognition of North Korean military contributions is a normalization of the alliance. It legitimizes it in the eyes of both populations and the respective allies of both countries.

The response of the Quartet: United States, South Korea, Japan, Australia

Accelerating security partnerships

In the face of the rising Russia-North Korea alliance, America's Asia-Pacific allies have intensified their cooperation. The Trump-Lee summit of October 2025 produced explicit Washington support for South Korea's nuclear submarine program, civilian uranium enrichment, and spent fuel reprocessing. This is a major strategic decision that implicitly acknowledges that Russian transfers to North Korea are changing the regional nuclear equation.

Japan has also accelerated its rearmament. Its defense budget for 2025-2026 reached levels unseen since the Second World War. Tokyo has acquired long-range missiles capable of striking North Korean facilities. Australia, for its part, is advancing under the AUKUS framework with its own nuclear-powered submarines. The Indo-Pacific security dynamic is reformatting itself at a pace few analysts anticipated five years ago.

Russia facing the consequences of its own transfers

There is a military irony in Russia's trajectory: by transferring nuclear submarine technology to North Korea, Moscow accelerated the American decision to support the same program in South Korea. In trying to strengthen its North Korean ally, Russia inadvertently helped create an environment where its own naval technologies — a sector in which Russia still maintains significant expertise — end up in the hands of actors who will eventually use them against its allies. That is the geopolitical boomerang of military adventurism.

Moscow officially protested against the South Korean submarine program, claiming it would violate the Nuclear Non-Proliferation Treaty. This protest is an admission: Russia knows that its transfers to Pyongyang triggered a regional reaction it no longer fully controls. It opened a technological Pandora's box whose consequences have outgrown its initial calculations.

Sanctions: an international regime in collapse

Russia vetoes any additional UN sanctions

The UN sanctions regime against North Korea, painstakingly built over decades, is collapsing. Russia has made clear it will veto any new sanctions resolution against North Korea at the Security Council. Its Foreign Minister, Sergei Lavrov, declared in early 2026 that it was "unrealistic" to expect a UN vote against Pyongyang. China has also stopped supporting sanctions, abstaining during relevant votes.

The UN Panel of Experts tasked with monitoring North Korean sanctions violations was itself dissolved in 2024 following a Russian veto. This is not an administrative detail — it is the deliberate elimination of the international monitoring mechanism. Without that panel, documenting sanctions violations becomes far harder, and actors who ignore those sanctions — Russian companies, Chinese intermediaries — can operate in a much more comfortable gray zone.

Alternative sanctions: bilateral and sectoral

Facing UN paralysis, Washington and its allies have developed alternative strategies: bilateral sanctions targeting specific entities that facilitate Russia-North Korea transfers, enhanced export controls on dual-use technologies, and increased maritime surveillance of suspect vessels. These measures have some effect, but they remain piecemeal compared to a coherent multilateral sanctions regime.

The political lesson is bitter: security multilateralism works until a great power decides to ignore it. Russia made that choice. China is tacitly aligning with it. And the world is left with a nuclear non-proliferation regime whose two most actively proliferating permanent members of the Security Council can no longer be held accountable by the system they helped create.

The acceleration of North Korean rearmament: Kim Jong-un's timeline

The 2021-2026 program ahead of schedule

The Stimson Center, an American research organization, analyzed the military development objectives that Kim Jong-un set at the 8th Congress of the Korean Workers' Party in 2021. Of the 13 nuclear and conventional systems designated as development objectives, four are already operationally deployed and two more could be by 2026. Russian assistance has clearly accelerated this timeline.

Kim Jong-un has also called on North Korean youth aged 14 to 30 to join the armed forces and fight alongside Russia. Euromaidan Press reported in May 2026 that Kim issued this appeal after losing around 6,000 troops at Kursk. The death of thousands of soldiers has not dampened his enthusiasm for the Russian alliance — he sees it as an opportunity to train more soldiers under real combat conditions.

The victory parade as an international signal

In May 2026, North Korean soldiers marched in Russia's Victory Parade in Moscow. It was a historic first, laden with symbolic weight. These soldiers were presented as heroes of the "liberation of Kursk." Russia even promised to erect a monument in their honor. This public institutionalization of the alliance goes beyond the symbolic: it normalizes North Korean participation in Russian wars in the eyes of both populations.

For Kim Jong-un, the alliance with Putin has demonstrated something essential: his regime can not only survive Western sanctions, but thrive by becoming indispensable to a great power. This demonstration of resilience and utility is a message sent to his own population as much as to the international community. Isolation does not lead to collapse — that is the conclusion Kim draws from Russia's Ukrainian experience.

China: an interested observer of the Russia-North Korea alliance

Beijing between formal alliance and strategic pragmatism

China occupies a paradoxical position in this equation. It is technically North Korea's main trading partner and one of the guarantors of its security. But it has watched with some unease the tightening of the Russia-North Korea alliance — because this alliance strengthens Kim's strategic autonomy and reduces his dependence on Beijing. A Kim less dependent on China is a Kim less controllable.

At the same time, China benefits from the axis of resistance that the Russia-North Korea-Iran ensemble forms against the American order. It does not have to pay the costs — political, human, economic — of this contestation. It reaps the strategic dividends: weakening of American power, diversion of Western military resources, and economic opportunities in the spaces created by instability. China remains the silent grand beneficiary of the war in Ukraine.

What the Russia-North Korea alliance changes for Taiwan

The North Korean military buildup — with Russian assistance — has direct implications for the scenario of a Sino-American confrontation over Taiwan. If a crisis erupts in the Taiwan Strait, a North Korea in possession of advanced electronic warfare capabilities and nuclear submarines could open a second front against South Korea and Japan, dispersing American military resources across two simultaneous theaters.

This is not a hypothetical scenario: it is basic military logic. China understands it. North Korea understands it. Washington understands it too — which is why support for South Korea's and Japan's defense capabilities is such a strategic priority for successive American administrations, regardless of their political color.

What can the West do in the face of this axis?

Supporting Ukraine means containing North Korea

The most direct connection the West can make is this: every dollar invested in Ukraine's defense is also an investment in Asia-Pacific security. As long as Ukraine holds, Russia needs North Korean resources. As long as Russia needs those resources, it keeps paying — in technology. Militarily weakening Russia in Ukraine means reducing Moscow's capacity to offer technological compensation to Pyongyang.

That is one more reason not to abandon Ukraine midway. Americans and Europeans debating "Ukraine fatigue" must understand that it is not only Ukrainian freedom at stake — it is the military technological balance in the Pacific. Zelensky is fighting for us, in the literal sense, even when Western leaders hesitate to say so out loud.

Reinvesting in the architecture of non-proliferation

The West must also rebuild the international monitoring mechanisms Russia deliberately destroyed. This means finding alternatives to paralyzed UN mechanisms — coalitions of willing states, bilateral intelligence-sharing agreements, independent verification mechanisms. The UN Panel of Experts on North Korea is dead. An equivalent must be rebuilt, beyond reach of the Russian veto.

This also requires an honest conversation with China — which reaps the benefits of destabilization without paying its costs. Beijing can choose to keep tacitly enabling North Korea to violate sanctions while benefiting from the relative stability the United States provides across Asia-Pacific. Or it can choose to play a constructive role in containing Pyongyang. That choice deserves sustained and explicit diplomatic pressure from the West.

Conclusion: the West faces a systemic threat it can no longer ignore

Breaking out of silos to see the system

The Russian technology transfer to North Korea is not a separate story from the war in Ukraine, the Iranian threat, or the Sino-American competition. It is a single story — that of an axis of revisionist powers contesting the Western liberal order in a coordinated and systemic manner. North Korean nuclear submarine propulsion, the Iranian drone over Kyiv, Russian oil purchased by Beijing — it is the same phenomenon seen from multiple angles.

The West habitually responds to crises one by one, with different teams, different budgets, different doctrines. This siloed approach is the main advantage our adversaries exploit. They think in systems. We think in silos. That is a posture deficit that the FDD, with its book Axis of Aggressors, is precisely attempting to correct by naming the coherence of what we are facing.

Zelensky as the forward line of defense for the Pacific

The ultimate irony is that Volodymyr Zelensky — by resisting the Russian invasion — has inadvertently become one of the front lines of Indo-Pacific security. Every day Ukraine holds, Russia cannot fully reconstitute its capabilities, transfer more technologies to Kim, or free up its resources for other theaters. The war in Ukraine is a European war with global consequences. Ukrainians are fighting for themselves — but also for all of us.

Understanding this is understanding why abandoning Ukraine is not just morally unacceptable. It is also strategically suicidal. The West must remain the center of the world — not out of arrogance, but because the alternative is a world run by regimes that treat their citizens as livestock and their neighbors as colonies. The Russian technology transfer to Pyongyang is a warning. It must be heard clearly.

Conclusion: naming the axis, understanding the threat, acting accordingly

Technology as the currency of a new Cold War

The Cold War of yesterday was played out in ideologies and intercontinental nuclear missiles. The Cold War of today is played out in dual-use military technologies — submarine propulsion, electronic warfare, drones, precision missiles. Russia understood that the best investment to maintain its influence was to transfer these technologies to its allies. Kim Jong-un understood it too. The West must understand the same — and play the game with the same strategic coherence, but in the direction of democratic values.

The second anniversary of the Russia-North Korea treaty of June 2026 is not an incidental date in the archives of diplomacy. It is the marker of a profound transformation in the global security architecture. A transformation that has taken place, in large part, on the backs of Ukrainians. History will remember this moment. The question is whether the West acted in time to change the ending.

The urgency of Western strategic coherence

The Atlantic Alliance is stronger than it has been at any point since the end of the Cold War — in terms of political unity and willingness to spend on defense. But strength is nothing without coherence. Ukrainian, Indo-Pacific, and non-proliferation policies must be built as the components of a single strategy, articulated around one common objective: maintaining the international liberal order against the coordinated assaults of its adversaries. Not in silos. As a system.

This effort demands duration, patience, and honest public communication with Western populations about the real stakes. Citizens of democracies deserve to be told why the defense of Ukraine also concerns Pacific security. Why technology transfers to Pyongyang affect them directly. Why Zelensky is fighting for them too. Democracy cannot wage a long war without the support of its peoples. And its peoples cannot support what they do not understand.

By Maxime Marquette, columnist

Columnist's transparency note

Editorial position and limits of the analysis

This article is based on publicly available sources as of late June 2026: the analysis by the Foundation for Defense of Democracies published on June 25, 2026, updates from the Institute for the Study of War (ISW), reports from South Korean intelligence services made public, and the international media outlets cited in the sources section. The author takes a pro-democracy, pro-Ukraine position, supportive of maintaining the international liberal order. This position is assumed and transparent.

Certain claims regarding technology transfers — notably the submarine reactor modules — remain at the stage of reports confirmed by intelligence services but not independently verifiable through public means. The author explicitly flags this and does not assert more than public sources allow. The figures for North Korean soldiers deployed and killed come from various Ukrainian and South Korean sources and may vary depending on the estimates used.

Sources and method

The writing of this article drew on the primary FDD analysis of June 25, 2026 and on a set of secondary sources documenting the context of the Russia-North Korea alliance since 2022. No fact has been invented. The editorial passages in italics represent the columnist's personal opinions, clearly distinguished from factual elements. All direct quotations are attributed to their sources.

The columnist acknowledges that the analysis of Russia-North Korea dynamics is a domain where information is partly classified and where estimates may evolve. The article should be read as an analysis of the situation at the time of writing, subject to revision as new information becomes available.

Sources

Primary sources

Foundation for Defense of Democracies — Kim Pushes for Faster North Korean Defense Buildup With Russia's Help — June 25, 2026

Institute for the Study of War — Korean Peninsula Update — February 17, 2026

Kyiv Independent — Nearly 11,000 North Korean troops stationed in Russia's Kursk Oblast — February 13, 2026

Secondary sources

Defense News — Experts worry about nuclear quid pro quo in Russia-North Korea alliance — February 20, 2026

Euromaidan Press — Kim Jong-un urges North Korean youth to fight for Russia — May 5, 2026

The Guardian — Kim Jong-un strengthens military ties with Russia — April 27, 2026