DECODING: Submarines and electronic warfare: Moscow arms Pyongyang to the teeth

DECODING: Submarines and electronic warfare: Moscow arms Pyongyang to the teeth

Introduction: a military alliance reshaping the axis of danger

The silent pact that has Seoul and Washington worried

When Vladimir Putin and Kim Jong-un signed their mutual defense treaty in June 2024, many Western analysts shrugged. A dictator running on fumes, they said, cozying up to a pariah regime to get artillery shells. Two years later, that naive picture has shattered. What is happening between Moscow and Pyongyang is no longer a munitions-for-labor exchange — it is a systematic military technology transfer, methodical and potentially irreversible.

According to an analysis published on June 25, 2026 by the Foundation for Defense of Democracies (FDD), Russia has transmitted to North Korea technologies covering submarine propulsion, acoustic stealth, Pantsir-M air defense systems, and advanced electronic warfare. In parallel, the accuracy of North Korean KN-23 ballistic missiles has been significantly improved using Russian guidance data. This is no longer cooperation — it is proliferation.

Second anniversary, first serious warning

On June 19, 2026, the exact second anniversary of the Russia-North Korea mutual defense treaty, Kim Jong-un demanded a drastic acceleration of national military reconstruction from his generals. The language used in North Korean state media was unambiguous: a destructive military posture, an army capable of striking at any time, in any place. Not rhetoric — a roadmap.

Meanwhile, Volodymyr Zelensky was alerting the international community: 10,000 North Korean soldiers are deployed on Russian territory, according to his own intelligence services. Seoul confirmed on its end that approximately 11,000 DPRK soldiers had been sent to the Kursk region, of whom around 2,300 have been killed since the start of their deployment. These are figures that stagger the mind — and that reveal the true depth of this bilateral commitment.

The technology transfers: what Moscow is really giving Kim

Submarines, silence, and stealth: a revolution beneath the seas

The most alarming of the transfers concerns submarine technology. Russia, whose navy has developed decades of expertise in silent propulsion and acoustic signature reduction, is now transmitting this precious know-how to Pyongyang. North Korean submarines, historically noisy and detectable, could within a few years become a real threat to the South Korean navy and American aircraft carriers in the Yellow Sea.

The FDD specifies in its book Axis of Aggressors that these transfers include techniques for anechoic coating, vibration reduction, and propulsion system design — exactly what North Korea needed to modernize its fleet of conventional submarines. It is a twenty-year technological leap that Pyongyang could never have achieved on its own, even in a decade.

Electronic warfare: jam, blind, paralyze

The electronic warfare transfers are equally concerning. Russia, drawing on its experience in Ukraine — where it has refined its systems for GPS jamming, interception of encrypted communications, and drone neutralization — is now exporting these capabilities to the DPRK. According to the FDD, Pyongyang is receiving equipment and training that allows it to jam adversary guidance systems and neutralize enemy military communications in real time.

For Seoul, which has announced plans to deploy an army of 500,000 soldier-drones and 20,000 autonomous drones by 2030, these transfers represent a direct threat. If North Korea can jam the guidance signals of South Korean drones, Seoul's entire defense doctrine — built on technological drone superiority — collapses. This is not an abstract threat — it is a real vulnerability.

The KN-23 boosted by Russian data: lethal precision

A transformed North Korean ballistic missile

The KN-23, a short-range ballistic missile built by North Korea on the Russian Iskander model, was already a formidable weapon. But since the start of intensive military cooperation with Moscow, its accuracy has been considerably improved. Russian data on inertial guidance, GPS terminal corrections, and impact analysis have been integrated into new versions of the missile, according to FDD findings.

This refinement is not trivial. An upgraded KN-23 can now strike precise military targets — air bases, ammunition depots, command centers — with a considerably reduced margin of error. For South Korea, this means that military infrastructure previously believed to be beyond accurate strike range is now a potential target. The strategic equation of the Korean Peninsula has just changed.

Pantsir-M: North Korean air defense in transformation

Added to these transfers is the transmission of the Russian Pantsir-M anti-aircraft system, designed to neutralize cruise missiles, drones, and low-altitude aircraft. For a North Korea whose air defense historically rested on aging Soviet equipment, acquiring this technology represents a major qualitative leap.

The Pantsir-M can process multiple targets simultaneously, reacts within seconds, and can be deployed on mobile vehicles — making its location and preemptive destruction far more difficult. South Korea and the United States, whose deterrence doctrine rests on the ability to strike deep with precision strikes, will now have to contend with an adversary capable of protecting its most sensitive sites.

North Korean soldiers in Russia: cannon fodder or combat apprentices?

11,000 soldiers deployed, 2,300 dead: the price of partnership

The deployment of North Korean soldiers in Russia constitutes the other — human — dimension of this alliance. According to figures from Seoul confirmed by Ukrainian sources, approximately 11,000 DPRK soldiers were deployed in the Kursk region since late 2024. Approximately 2,300 of them have been killed, according to estimates — a casualty rate of roughly 21%, a brutal figure even by this war's standards.

Volodymyr Zelensky described this presence as incredibly dangerous, not because of the individual military value of these soldiers — who often proved poorly trained for modern conventional warfare — but because of what they bring home: real combat experience, drone warfare tactics absorbed in the field, and direct knowledge of Western weapons systems supplied to Ukraine.

South Korea accepts prisoners: a major diplomatic signal

A quiet but weighty development: Seoul has agreed to receive North Korean soldiers captured by the Ukrainian army who volunteer for transfer to South Korea. It is a diplomatically complex decision — Pyongyang treats any captured soldier as a traitor — but it sends a clear message: South Korea views these soldiers as victims of the Kim regime, not as irreconcilable enemies.

This initiative also allows South Korean intelligence services to obtain firsthand information on the training, equipment, command structures, and combat lessons learned by North Korean units deployed in Russia. It is valuable human intelligence that will feed Seoul's strategic planning for years to come.

Russian concern over U.S.-South Korean exercises

Moscow steps out of its reserve and raises its voice

On June 25, 2026, the official Russian agency TASS published a Foreign Ministry statement expressing growing concern over the joint military activities of the United States and South Korea in the region. Moscow denounced what it called "deliberate escalation" and "destabilization of the Korean Peninsula" — an extraordinary claim from a country importing missiles there and sending foreign soldiers.

This Russian diplomatic outburst reveals an often-overlooked reality: Russia does not view Northeast Asia as a secondary theater. It has direct strategic interests there — notably maintaining a buffer-state North Korea — and is investing heavily in terms of military and political capital. Moscow's complaint is therefore less a diplomatic protest than a warning: touch this balance and we will see.

Washington caught between two fires: Ukraine and Korea

For the American administration, this evolution places Washington in an unprecedented strategic situation. The United States must simultaneously support Ukraine against Russia, reassure South Korea in the face of an increasingly sophisticated North Korea, and manage a tense relationship with a China watching every move. Military resources, command systems, intelligence flows — everything is under strain at once.

The question posed to Washington is no longer only how to restrain Putin in Europe — it is now how to respond to a North Korea that will tomorrow hold the technologies Russia developed against NATO. That is a question without a simple answer, and America's Asian allies know it.

The Axis of Aggressors: what the FDD book reveals

An assumed proliferation doctrine

The Foundation for Defense of Democracies published in 2026 a work titled Axis of Aggressors, which documents in detail the systemic nature of Russia-North Korea military cooperation. The work goes far beyond weapons exchanges — it demonstrates the existence of a shared proliferation doctrine aimed at counterbalancing Western technological superiority by equipping authoritarian regimes with cutting-edge technologies.

According to this analysis, Russia is not only seeking North Korean munitions to fuel the war in Ukraine. It is seeking to build a network of alternative military powers — including Iran and, to some extent, China — that together saturate Western surveillance, response, and deterrence capabilities. This is a long-term strategy, not a short-term survival measure.

Iran, China, Russia, North Korea: the convergence of threats

The FDD report highlights that Iran also benefits from Russian technology transfers — notably in drones and ballistic missiles — while China observes, absorbs, and develops its own synergies with this axis. It is no coincidence that the four regimes coordinate their diplomatic signals, military provocations, and counter-media narratives with striking regularity.

Faced with this axis, the West still struggles to formulate a coherent response. Sanctions strike, but transfers continue. Declarations condemn, but treaties proliferate. NATO, the European Union, the G7, and Indo-Pacific democracies must now envision a coordinated response that transcends the traditional geographic boundaries of their alliances.

The Kim doctrine: acceleration at any cost

Kim demands faster, stronger, more secret

The message from Kim Jong-un to his generals, reported in North Korean state media on the treaty's second anniversary, was unequivocal: accelerating the national defense program is an absolute non-negotiable priority. Kim specifically cited the need to improve precision strike capabilities, develop conventional nuclear submarines, and strengthen offensive cyber capabilities.

Each of these priorities corresponds exactly to the domains in which Russia is currently transferring technologies to Pyongyang. This is not a coincidence — it is a program. Kim knows what he is receiving, Putin knows what he is giving, and both regimes share a vision of what they are building together: a parallel deterrence architecture that would make any Western military intervention in their sphere of influence extremely costly.

The destructive posture: rhetoric or operational planning?

The expression used in North Korean state media — destructive military posture — is not pure rhetoric. Experts in North Korean military doctrine see it as a reference to a strategy of massive preemptive strikes designed to neutralize adversary military advantages before those can be deployed. Combined with the new Russian technologies, this doctrine acquires an operational credibility it did not have three years ago.

South Korea's National Intelligence Service confirmed that Pyongyang has intensified simulation exercises targeting air bases and naval installations. These simulations now incorporate scenarios of prior electronic jamming — exactly what Russian electronic warfare technology enables. The loop is complete.

What can the West do? The options on the table

Sanctions, counter-proliferation, and shared intelligence

The Western response to this proliferation axis begins with strengthening technology export control regimes. Dual-use technologies — electronic components, specialized materials, simulation software — continue to reach Russia via third countries, notably China, Turkey, and certain Central Asian states. Closing these gaps is an absolute priority, but one requiring diplomatic cooperation that the West has yet to fully mobilize.

On shared intelligence, the Five Eyes, NATO, and Indo-Pacific democracies (Japan, South Korea, Australia) must intensify cooperation to monitor in real time the technology transfers between Moscow and Pyongyang. More robust early warning mechanisms would allow anticipating and blocking transfers before they become operational.

Strengthening Seoul: advanced deterrence as a response

For South Korea, the response requires accelerating its own military modernization — and strengthening American presence on the peninsula. The 500,000 soldier-drones program announced by Seoul is a direct response to Pyongyang's growing capabilities. But more is needed: strengthening deep-strike capabilities against North Korean launch sites, developing robust electronic countermeasures, and ensuring that American submarines in the Yellow Sea maintain a durable acoustic superiority.

NATO, for its part, should formally recognize the strategic link between the European and Indo-Pacific theaters. The war in Ukraine is not separate from the rise of North Korean power — it is its direct fuel. Acknowledging this reality is the first step toward a coherent response.

Conclusion: the axis that grows while the West deliberates

A window of opportunity that is closing

The history of unchecked military proliferation is always the same: the warning signs are visible, there is deliberation, then delay, and one day you find yourself facing an adversary armed with technologies you did not think were within their reach. Russia-North Korea military cooperation is no longer at the signal stage — it is at the stage of facts. Quieter submarines, more accurate missiles, operational electronic warfare systems, soldiers hardened by modern combat: the North Korea of 2028 will look nothing like that of 2022.

The West still has a window to act — reinforcing sanctions, plugging technology transfers, consolidating Indo-Pacific alliances, and above all, treating this threat for what it is: an integral component of the strategic challenge posed by the Russia-China-Iran-North Korea axis. Deliberating for another five years is not an option. Proliferation does not wait.

The price of inaction

Every technology transferred today is a strategic decision that North Korea will no longer have to make tomorrow. Every North Korean soldier returning from Russia is a potential war instructor. Every upgraded KN-23 is an additional threat against South Korean cities. The cost of inaction is not paid in deliberations — it is paid in human lives, regional destabilization, and a Western credibility that erodes with each ignored transfer.

This is not alarmism. It is strategic accounting. And the numbers, for now, are not in our favor.

By Maxime Marquette, columnist

Columnist's transparency note

Editorial positioning

This decoding draws on analyses published by the Foundation for Defense of Democracies, South Korean intelligence data reported by international media, and official statements cited by TASS and ABC News. The columnist has no access to classified information. All analyses are derived from open and publicly verifiable sources.

The editorial positions expressed in this article's mini editorial passages are exclusively personal opinions. They do not represent any institutional position and should be read as the columnist's subjective perspective on the documented facts cited throughout the article.

Limitations and uncertainties

North Korean casualty figures and details of technology transfers come from intelligence sources whose independent verification remains difficult. The columnist reports them with the appropriate caveats, explicitly noting their origin. The editorial positions expressed in the mini editorial passages reflect exclusively the columnist's personal viewpoint and do not constitute factual assertions.

Readers are encouraged to consult the primary and secondary sources listed at the end of this article to form their own judgment. Journalism, even committed journalism, benefits from multiple readings and cross-referenced sources.

Sources

Primary sources

Foundation for Defense of Democracies — Kim pushes for faster North Korean defense buildup with Russia's help — June 25, 2026

ABC News — North Korea vows destructive military posture — June 25, 2026

TASS — Russia expresses concern over US-South Korea military activities — June 25, 2026

Ground News — Zelensky: 10,000 North Korean soldiers in Russia — June 2026

Secondary sources

Ground News — North Korea vows deeper ties with Russia — June 19, 2026

Euromaidan Press — Context: authoritarian axis military cooperation — June 2026