REPORT: Undersea Nuclear Competition Enters an Unprecedented Phase

Introduction: a launch that redefines the silent race beneath the depths

One missile, a new phase, an already old race

On July 6, 2026, the Chinese navy fired a ballistic missile from a nuclear-powered submarine, in a sequence that, according to USNI News, saw the weapon cross north of the Philippine island of Luzon before splashing down between Nauru and Tonga. The launch coincided, almost to the hour, with the start of the annual Sino-Russian naval exercise in the Yellow Sea, a convergence that no serious regional analyst missed.

This is not an isolated event in a race that has run for decades among nuclear great powers. But the way this launch was carried out, documented and interpreted by international analysts marks, according to The Diplomat, entry into a new phase of the undersea nuclear competition in the Indo-Pacific, one where technical stealth now matters as much as a missile's raw range.

Why submarines change the strategic equation

A submarine-based launcher offers an advantage no other platform provides: the ability to survive a first strike and respond from depths that are difficult to locate, what is known as second-strike capability. It is precisely this capability that China appears to be validating, according to analysts cited by Reuters, with its six Type 094 submarines based on Hainan island.

Security researcher Collin Koh, of the S. Rajaratnam School of International Studies in Singapore, told Reuters that this technical dimension was being scrutinized closely by Western intelligence services, as much as the broader political message Beijing was seeking to send to its rivals and its allies.

What this launch really reveals is not simply a missile flying farther, it is a silent race between powers accelerating beneath the surface of the oceans, far from cameras, but with very real consequences for the global strategic balance.

The JL-3, centerpiece of an ambition for a complete triad

A range exceeding 10,000 kilometers

According to The Diplomat, Chinese military commentators and outside analysts lean toward a launch involving the JL-3, a missile whose range is estimated at more than 10,000 kilometers. That range would let China threaten a large part of the American mainland from patrol areas much closer to its own coasts, reducing the exposure of its submarines to adversary surveillance forces.

The JL-3 was publicly unveiled at Beijing's military parade in September 2025, and is believed capable of carrying multiple warheads. Its operational validation, if confirmed, would mark a significant advance in China's ability to complete its nuclear triad: strike from land, air and sea.

The Global Times and the claim of a completed triad

Chinese state media outlet Global Times presented this launch as proof of the continuous strengthening of China's nuclear triad, claiming this demonstration "will force outside powers and their followers to abandon their attempts to force Chinese concessions through maximum military pressure or preemptive strikes," according to remarks relayed by Reuters.

The New York Times, however, qualified this claim as hyperbole: China remains far from being able to operate nuclear-armed submarines undetectably wherever it wishes, a technical limit that contradicts the rhetoric of completed power pushed by Chinese state media.

Between the claim of a fully operational nuclear triad and the more modest technical reality described by independent analysts lies a gulf that Chinese propaganda works hard to fill with triumphant press releases. The truth, as often, sits between the two extremes.

The American response: reinforced surveillance, open worry

A detection network mobilized permanently

According to Reuters, the United States and its allies try to track Chinese submarines using warships, underwater sensor networks deployed at strategic chokepoints, and aerial patrols using P-8 Poseidon aircraft. This permanent surveillance architecture shows just how much the operations of China's SSBN fleet based at Hainan rank among the highest intelligence priorities for Washington.

A Pentagon report from 2022 had already noted that China was beginning to conduct near-continuous deterrence patrols with its SSBNs, a development that considerably raised the priority American intelligence services assign to monitoring this specific fleet.

The State Department denounces persistent opacity

The U.S. State Department confirmed it had monitored the launch of an unarmed intercontinental ballistic missile from a Chinese submarine, and criticized the launch, citing a "rapid and opaque" buildup of China's nuclear arsenal, according to The Diplomat. This now-recurring criticism underscores Washington's persistent frustration with the absence of direct, transparent strategic dialogue with Beijing on this file.

This Chinese opacity significantly complicates Western efforts to establish reliable de-escalation channels in the event of a future crisis involving the undersea nuclear capabilities of both powers.

You cannot build reliable de-escalation with a power that systematically refuses transparency about its most sensitive capabilities. This Chinese opacity, documented launch after launch, should worry us far more than the raw technical range of its new missiles.

Russia, the discreet partner in a three-way competition

Marine Interaction 2026, a calendar coincidence that carries weight

The Chinese launch coincided with the start of the annual Sino-Russian naval exercise, called Joint Sea on the Chinese side and Marine Interaction 2026 on the Russian side, which ran from July 6 to 13 in the Yellow Sea, according to USNI News. Russia deployed for the occasion the cruiser Varyag, the corvette Rezkiy, the rescue ship Igor Belousov, and the attack submarine Ufa, all arriving in Qingdao on July 5.

China, for its part, deployed the cruiser Anshan, the destroyer Kaifeng, the frigate Wuhu, the supply tanker Kekexilihu, the rescue ship Yangchenghu and an attack submarine of the Yuan class. This joint mobilization, under the theme of a "joint response to maritime security threats," illustrates military cooperation that goes well beyond mere symbolic gestures.

A three-way competition that complicates Western calculations

This exercise, which dates back to 2012, included submarines for the first time last year, and joint Russian-Chinese patrols in the western Pacific have existed since 2021, extending in 2023 as far as the approaches to Alaska and the Aleutian Islands. This continuity demonstrates a clear strategic intent to normalize joint Sino-Russian military presence.

Western strategists must now anticipate not a bilateral competition between Washington and Beijing, but a three-way dynamic in which Moscow and Beijing are learning to synchronize, at least partially, their respective military calendars.

Watching Russia and China synchronize their military calendars, even partially, should force the West to abandon the comfortable idea that these two powers act in separate silos. They are learning, year after year, to coordinate more than is publicly acknowledged.

India, an uneasy spectator directly concerned by this race

An Indian undersea deterrent still under construction

China is not the only Asian power investing massively in its undersea deterrent capability. India is also developing its own fleet of ballistic-missile submarines, aware that China's progress in this domain directly alters the strategic balance along its own maritime and continental borders.

This regional dynamic widens the reach of the undersea nuclear competition well beyond the sole Sino-American standoff, turning the Indo-Pacific into a theater where several nuclear powers simultaneously seek to strengthen their undersea second-strike capability.

A region where every technical advance triggers a response

This now-multipolar race creates a ripple effect in which every technical advance by one power pushes its regional rivals to accelerate their own programs, following a classic logic of strategic competition that recalls, in some respects, the arms race of the Cold War, but with more actors involved simultaneously.

This multiplication of actors considerably complicates the task of Western diplomats seeking to establish de-escalation frameworks, now confronted not with two, but with several undersea nuclear powers operating within the same constrained strategic space.

This race is no longer a duel between two giants, it is becoming a multi-party competition where every new capability triggers a reply elsewhere in the region. No one seems willing to slow down, and that is precisely what should worry us most.

The September 2024 precedent: the trajectory of an acceleration

A first land-based signal, largely underestimated

This July 6 launch follows the most significant long-range ballistic missile test conducted by China since September 2024, when the People's Liberation Army fired a weapon into the South Pacific from a mobile land launcher based on Hainan island, according to Reuters. That precedent, less symbolically spectacular since it did not involve an undersea platform, had nonetheless already raised serious regional concerns.

The shift from a land-based launch in 2024 to an undersea launch in 2026 marks a deliberate progression in the demonstration of Chinese capabilities, with each step adding another brick to the edifice of the nuclear triad that Beijing seeks to present as complete.

Only three launches in several decades over the Pacific

According to The Diplomat, this July 6 launch was only the third time China had conducted a long-range missile test over the Pacific. This historical rarity gives all the more weight to the recent acceleration observed since 2024, marking a clear break from Beijing's traditional reluctance to test its missiles in international skies and oceans.

This acceleration, documented over just two years, traces a curve that worries Western analysts far more than any single launch taken in isolation: it is the pace of change, more than the change itself, that constitutes the most concerning strategic signal.

A curve accelerating over two years, after decades of near-total rarity, is no longer a statistical coincidence. It is a deliberate political decision by Beijing to normalize a behavior it carefully avoided until recently.

Internal purges, a persistent shadow over Chinese reliability

A missile force weakened by years of purging

A study relayed by the Bulletin of the Atomic Scientists, cited by Reuters, notes that the purges led by Xi Jinping against military officials, including commanders of the People's Liberation Army's missile force, make it unlikely, under normal circumstances, that nuclear warheads would actually be handed over to the military outside a major crisis context.

This finding casts a significant shadow over the real scope of the July 6 demonstration: technical capability may advance, but overall operational reliability remains conditioned by the internal political stability of the apparatus managing this arsenal, a stability the repeated purges have clearly weakened.

A paradox that official propaganda cannot hide

This paradox, between showcased technical modernization and documented internal political instability, considerably complicates Western assessment of the real threat posed by this new phase of the undersea nuclear competition. A technically advanced weapon whose chain of command remains weakened by repeated purges does not pose the same threat as an equivalent weapon within a stable political system.

This nuance, essential for a rigorous strategic assessment, is often absent from the triumphant press releases relayed by Chinese state media, which prefer to emphasize missile range over the fragility of the chain of command controlling them.

A powerful weapon in politically unstable hands is more worrying than an equivalent weapon within a reliable system. This nuance, largely absent from public debate, should guide Western assessment of this new phase of undersea competition.

Taiwan's role in mapping regional risk

A Taiwanese transparency that documents uncertainty

It was Taiwan's National Security Council that published the most detailed trajectory map of this launch, later relayed by Defense News. This transparency, driven by Taiwan's own security concerns regarding Beijing, provided the international community with information that China itself had not shared with such a level of detail.

This Taiwanese contribution illustrates how directly concerned the island remains by every Chinese military advance, including those that, on the surface, target distant areas like the South Pacific, but which in reality strengthen Beijing's overall deterrent capacity against any potential foreign intervention around Taiwan.

An undersea capability that weighs on the strait calculus

A more credible undersea nuclear deterrent strengthens, in the background, Beijing's ability to deter foreign intervention in the event of a crisis around Taiwan, which worries Taipei as much as Washington, long committed to supporting the island's defense against any potential aggression.

Every Chinese missile launch, even one aimed at a distant area, is therefore analyzed in Taipei as an indicator of the overall military trajectory of its most threatening neighbor, reinforcing the constant vigilance the island maintains on this file.

Taiwan documents what Beijing refuses to specify, not out of generosity, but out of strategic survival necessity. This transparency forced by fear says a great deal about the information asymmetry that defines this entire undersea competition.

The Type 096 successor: the next generation already in the works

A quieter platform, already in development

The Type 094, despite its central role in the July 6 launch, remains a platform that Beijing already considers transitional. The Type 096, still in development according to The Diplomat, is meant to be the next generation of Chinese ballistic-missile submarines, with enhanced acoustic stealth capabilities that Western analysts are already watching with particular attention.

This anticipation of a successor shows that today's demonstration, however symbolically impressive, is only one step in a continuous modernization trajectory ultimately aimed at making China's submarine fleet far harder for Western surveillance networks to detect and track.

What this next generation will change for Western surveillance

A quieter submarine would considerably complicate the task of the sensor networks and aerial patrols already mobilized to track current Type 094s. This prospect is already fueling budget discussions within allied defense ministries over the investments needed in advanced undersea detection for the coming decade.

Anticipating this technological evolution rather than discovering it after the fact is, for Western strategists, the only reasonable way to avoid being caught off guard once the Type 096 truly enters active service in the years ahead.

Focusing only on today's launch means already looking behind. The real strategic challenge is being built in Chinese shipyards, for a generation of submarines the West will have to learn to detect before it, too, becomes an accepted routine.

Regional alliances facing this new phase

The Australia-Fiji pact, symbol of rapid adaptation

A few hours before the Chinese launch, Australia and Fiji had announced a new mutual defense pact, according to The Diplomat. This type of bilateral agreement, increasingly common in the region, reflects a desire among Pacific middle powers to weave a collective security net against the growing uncertainty represented by this new phase of the undersea nuclear competition.

This proliferation of bilateral pacts is gradually drawing a denser regional security architecture, less dependent on a single actor, and better prepared to anticipate the regional consequences of Chinese and Russian technological advances in the undersea domain.

Coordination still insufficient given the scale of the challenge

Despite these bilateral initiatives, multilateral coordination among the region's leading democracies, the United States, Japan, Australia and South Korea, remains, according to several defense analysts, insufficiently structured to effectively respond to the scale of this new phase of undersea competition involving China, Russia and, to a lesser extent, North Korea.

This structural insufficiency represents, for many regional security experts, one of the most worrying blind spots in the current Western response to a threat that, for its part, continues to coordinate and visibly accelerate.

Scattered bilateral pacts will never replace structured multilateral coordination. As long as the West keeps responding in a scattered order to a threat that is coordinating more and more, the strategic advantage will keep slowly slipping toward Beijing and Moscow.

What this new phase means for global stability

A heightened risk of miscalculation between nuclear powers

Every new undersea capability demonstrated by a nuclear power mechanically raises the risk of miscalculation between strategic rivals, particularly in a context where direct communication channels between Beijing and Washington remain limited and sporadic. This dynamic particularly worries arms control specialists, who fear an unintended escalation born of misunderstanding rather than deliberate intent.

The absence of substantial strategic dialogue between the great nuclear powers over their respective doctrines for using ballistic-missile submarines aggravates this risk, with each side forced to rely on often partial or biased interpretations of the other's intentions.

The need for a dialogue framework no one seems willing to build

Despite these documented risks, no serious multilateral strategic dialogue initiative has recently emerged to frame this new phase of the undersea nuclear competition, with each power preferring to keep demonstrating its capabilities rather than negotiate common limits, a dynamic reminiscent of the worst moments of the previous century's arms race.

This absence of dialogue constitutes, for many observers, the real danger of this new phase: not the technical capability itself, but the lack of any serious mechanism to prevent a show of force from one day degenerating into a misunderstanding with catastrophic consequences.

What worries me most in this file is not the range of one more missile, it is the total absence of structured dialogue among the powers developing them. Without that dialogue, every new capability becomes a silent bet on the world's ability to avoid the one mistake too many.

The role of micro-states in a competition that dwarfs them

Nauru and Tuvalu, unwilling spectators of a giants' race

The micro-states of the South Pacific, like Nauru and Tuvalu, find themselves, against their will, at the geographic center of this new phase of competition, simply because their position places them along the trajectory of tests conducted by powers far larger than themselves. This geographic reality, independent of any political will on their part, illustrates the fundamental asymmetry that defines this undersea nuclear competition.

These nations have neither the military capacity nor the diplomatic weight needed to directly influence the trajectory of this competition, yet they directly bear its most concrete consequences, whether falling debris or the environmental uncertainty these tests systematically generate.

A collective voice slowly beginning to be heard

Facing this asymmetry, the South Pacific micro-states are beginning, through bodies like the Pacific Islands Forum, to develop a more assertive collective voice, seeking to weigh, even modestly, on international discussions concerning the undersea nuclear competition unfolding largely above their heads, literally and figuratively.

This still-nascent collective voice could, over time, form a significant moral counterweight against the great powers, provided it receives the diplomatic and financial support needed from Western partners genuinely committed to defending regional interests.

The smallest actors in this competition never chose to be part of it, but they could paradoxically become the moral conscience this game of power between giants currently lacks. Their voice deserves to be amplified, not ignored.

North Korea, a minor but unpredictable actor in this race

A rudimentary but progressing submarine program

North Korea is also pursuing a program to develop ballistic-missile submarines, far more rudimentary than China's or Russia's, but advanced enough to worry Seoul and Tokyo. Pyongyang has, in recent years, multiplied missile tests from naval platforms, seeking to demonstrate a minimal deterrent capability against its regional neighbors.

This North Korean progress, though technologically behind Chinese or Russian standards, adds an extra factor of unpredictability to a region already tense from the documented acceleration of the undersea nuclear competition among the great powers.

Why this minor actor complicates the overall strategic calculation

Unlike China and Russia, whose nuclear doctrines remain, despite their opacity, relatively predictable in broad strokes, North Korea introduces a dimension of political unpredictability that complicates any Western effort at coherent strategic modeling for the entire Indo-Pacific region.

This unpredictability, combined with Pyongyang's slow but real technical progress, forces Western military planners to factor in an additional scenario, already complicated by the joint rise of China and Russia in this same strategic domain.

North Korea remains, for now, a minor actor in this undersea race, but its political unpredictability weighs more heavily than its actual technical capability. It is precisely this type of actor, halfway between weakness and unpredictability, that makes strategic calculations hardest to establish with confidence.

What Seoul and Tokyo are watching most closely

Two American allies directly exposed to this acceleration

South Korea and Japan, two major strategic allies of the United States in the region, follow every development of the undersea nuclear competition involving China, Russia and North Korea with particular attention, aware that their own security directly depends on the strategic balance now taking shape beneath the waters of the Indo-Pacific.

This joint vigilance translates into growing investment in their own undersea detection capabilities, as well as strengthened coordination with Washington on surveillance data sharing, cooperation that nonetheless remains, according to several defense analysts, insufficiently structured to fully meet the scale of the regional challenge.

A region that will have to choose between dependence and strategic autonomy

Facing this documented acceleration, South Korea and Japan will, in the years ahead, have to choose between deepening their strategic dependence on American undersea surveillance capabilities, or making a more substantial investment in their own autonomous detection and deterrence capabilities.

This choice, far from purely theoretical, will concretely determine the strategic room for maneuver of these two Asian democracies in the face of an undersea nuclear competition that continues to accelerate with no observable sign of slowing.

South Korea and Japan can no longer afford to depend exclusively on American undersea surveillance capabilities. Their future security demands an autonomous investment that these two democracies will have to make, with or without stronger support from Washington.

Persistent dependence on American protection

Despite these growing investments, American protection remains, for now, the ultimate security guarantee for these two nations against the joint rise of China and Russia in this strategic domain. This persistent dependence underscores the crucial importance of maintaining a strong and consistent American commitment in the Indo-Pacific region.

Any perceived weakening of this American commitment, whether real or merely anticipated by regional allies, could further accelerate autonomous investments by Seoul and Tokyo, with potentially destabilizing consequences for the overall regional strategic balance.

What I fear most in this file is not the next Chinese or Russian capability, it is a weakening of American commitment that would push its own allies to doubt its reliability. That kind of trust, once cracked, would cost far more to rebuild than any submarine.

Conclusion: a race that is only beginning

What the July 6 launch really inaugurated

The launch of July 6, 2026 does not mark the end of an isolated demonstration, but the documented beginning of a new phase of the undersea nuclear competition in the Indo-Pacific, characterized by Chinese technical acceleration, growing coordination with Russia, and a still-fragmented Western response to a challenge taking shape for years to come.

This new phase is playing out both in the ocean depths, where submarines are becoming harder to detect, and in political capitals, where strategic trust between great powers keeps eroding with every new show of force carried out without substantial prior dialogue.

What the West will need to build to avoid being left behind

Facing this documented acceleration, the West will need to invest massively in its own undersea detection capabilities, strengthen multilateral coordination among its main Indo-Pacific allies, and seek, despite obvious political obstacles, to establish a minimal strategic dialogue with Beijing and Moscow to reduce the risk of catastrophic miscalculation.

Without this coordinated effort, this new phase of the undersea nuclear competition will keep unfolding on terms set by those investing most aggressively in their technical capabilities, leaving Western democracies and their regional partners in a reactive rather than proactive posture.

Signed Maxime Marquette, columnist

Columnist's transparency note

What I know and what I don't

I know that the Chinese navy fired a ballistic missile from a submarine on July 6, 2026, that this launch coincided with the start of the Sino-Russian naval exercise Marine Interaction 2026 in the Yellow Sea, and that analysts cited by Reuters and The Diplomat assess that it likely involved a JL-3 fired from a Type 094 submarine.

I do not know whether the coordination between the Chinese launch and the Sino-Russian exercise resulted from deliberate joint planning or a simple calendar coincidence. I also do not know with certainty the exact scope of the system's real operational capabilities, as the available assessments remain partial and at times contradictory. I prefer to say so clearly rather than present a hypothesis as an established fact.

Method

This report draws on articles published by USNI News on July 6, 2026, by The Diplomat on July 7, 2026, and by Reuters on July 10, 2026, as well as verifiable general geopolitical knowledge concerning Chinese nuclear posture and Sino-Russian military cooperation. No scene has been invented, no direct testimony is claimed.

My editorial angle is clear: I believe growing military coordination between China and Russia constitutes a systemic threat to the West that deserves to be documented with the greatest rigor, without giving in to exaggeration or minimization.

Sources

Primary sources

China Tests Submarine-launched Ballistic Missile, Kicks Off Annual Exercise With Russia — USNI News, July 6, 2026

China's Pacific SLBM Test Signals a New Phase in Undersea Nuclear Competition — The Diplomat, July 7, 2026

Missile test showcases sensitive Chinese submarine capabilities key to nuclear deterrent — Reuters, July 10, 2026

Secondary sources

Chinese ballistic missile test is said to undermine nuclear weapons-free zone in South Pacific — Defense News, July 7, 2026

Why China Fired a Long-Range Missile Into the Pacific — The New York Times, July 7, 2026

Regional coverage of the Chinese Pacific missile launch — Al Jazeera, July 7, 2026