China and Russia deploy submarines together in “Joint Sea-2026” drills

The joint deployment and first-ever combined visual capturing of Chinese and Russian submarines during a bilateral military exercise marks a major breakthrough in underwater coordination and signals an unprecedented level of mutual strategic trust between the two powers, according to military analysts.

The maritime phase of the joint naval exercise “Joint Sea-2026,” conducted by China and Russia, concluded on Saturday. According to China Bugle, the official media organ of the People’s Liberation Army (PLA) News and Media Center, submarines from both the Chinese and Russian navies were photographed together in the same frame for the first time during the drills.

Speaking to the Global Times, a military affairs expert said the development demonstrates a high level of mutual trust that goes far beyond ordinary bilateral relations.

During the exercises, Chinese and Russian naval units conducted drills covering submarine rescue, strikes on surface targets, air defense, and anti-missile operations. China Bugle reported that both sides deepened mutual trust and further enhanced their joint operational capabilities through highly effective coordination.

The drills employed a flexible planning approach and applied rigorous standards to operational coordination. The joint maneuvers were conducted without predetermined, fixed scenarios; instead, operations were dynamically adapted to real-time battlefield conditions, hydrometeorological factors, and other variable elements.

Participating forces were organized into mixed formations. By utilizing sea, air, and submarine platforms, the two militaries established a multi-domain, integrated combat system.

According to China Bugle, this integrated structure effectively tested both sides’ capabilities in joint reconnaissance and early warning, command coordination, and firepower strikes within complex electromagnetic environments.

During the air defense and anti-missile drills, Chinese and Russian vessels operated in close coordination with a clear division of tasks. Leveraging the distinct strengths of their respective weapon platforms, the forces successfully intercepted incoming targets in the shortest possible time, demonstrating the combined combat capability of the joint Chinese-Russian naval force.

Held regularly since 2012, the “Joint Sea” exercises have become a cornerstone platform for naval cooperation between China and Russia.

According to official statements, both sides deployed elite forces for this iteration of the drills, encompassing surface, underwater, aerial, and support assets. In particular, the participation of submarines and submarine rescue vessels indicates that bilateral naval cooperation continues to expand from surface operations to integrated surface and underwater combat.

Following reports that Chinese and Russian submarines had been captured in the same frame for the first time, Chinese military expert Wang Yunfei told the Global Times on Sunday that the event represents an extraordinary level of mutual trust.

Wang noted that joint submarine operations are exceptionally rare worldwide. By their very nature, submarines operate on the principle of stealth, and their acoustic signatures are guarded by every country as highly classified intelligence.

Pointing out that such vessels are rarely shown in close proximity to one another, Wang said the joint sighting of the two submarines indicates they were operating in close quarters.

Under these conditions, the expert noted, the acoustic signatures of the submarines—including not only their noise levels but also their frequency characteristics—could mutually expose secrets to one another.

Official footage of the exercise revealed that Russia’s improved Kilo-class conventional submarine, the Ufa, participated in the drills, while the Chinese side deployed an improved Type 039B conventional submarine.

According to Wang, when China previously operated Russian-built Kilo-class submarines alongside identical Russian vessels, the implications were different because the acoustic signatures of those platforms were already known to both parties.

However, Wang emphasized that on this occasion, China showcased its domestically developed Type 039B submarine—widely considered state-of-the-art globally—to Russia, reflecting a level of mutual trust that goes beyond standard military exchanges.

Wang also pointed out that the participation of submarines in joint exercises involves communication and data exchange, which serves as another key indicator of high-level mutual trust.

Communication between submarines is highly complex, Wang said, explaining that one method involves raising an antenna above the water’s surface at communication depth. The other method is underwater acoustic communication, where a connection is maintained using specialized equipment—a method that is technically far more challenging.

Regardless of the method used, Wang noted that both sides must share their technical communication characteristics, methods, and tactics with one another.

This level of sharing enables the parties to achieve a high degree of tactical coordination when facing common adversaries, the expert said.

It remains extremely rare for two submarines to participate in joint exercises, share communication data, and coordinate strikes against targets.

Wang said that the ability of China and Russia to achieve this reflects not only the high level of mutual trust between the two sides but also the strong self-confidence of the Chinese military in its own capabilities.

The expert added that this milestone serves as a positive starting point for increasing the depth and intensity of future joint maneuvers.

Following the conclusion of the drills, China Bugle reported that some of the participating forces will conduct joint naval patrols in relevant areas of the Pacific Ocean to continue contributing to regional and international peace and stability.

According to China’s official state news agency, Xinhua, China and Russia launched the “Joint Sea-2026” exercise on July 6 at a military port in Qingdao, located in eastern China’s Shandong province.

A joint command consisting of task forces from both countries’ navies was established to oversee the drills.

Xinhua reported that the exercise would be carried out in three distinct phases: the assembly of forces, port-based planning, and maritime operations.

With the maritime operations phase of the China-Russia “Joint Sea-2026” exercise now concluded, the Chinese Ministry of Defense issued a statement on Sunday.

The ministry stated that both parties will continue to adhere to the principles of openness, transparency, and mutual trust, while further expanding the scope and depth of their joint training.

The ministry added that both nations will make greater contributions to building a maritime community with a shared future and safeguarding global peace and stability.