“China Seeks Tumen River Access Through Alignment With North Korea and Russia” East Sea Could Emerge as New Maritime Power Flashpoint

Xi Jinping endorses Tumen River access initiative and statement backing North Korea
Move signals renewed push to restore East Sea access lost after the First Sino-Japanese War
Rising risk of Chinese and Japanese naval confrontation in northern East Sea waters

Discussions between China and Russia over navigation rights along the lower Tumen River have emerged as a potential fault line in the maritime order of Northeast Asia. While framed outwardly as a logistics and border development initiative, the project intertwines Russia’s demand for Far East expansion with China’s broader effort to circumvent the Indo-Pacific containment architecture. As Beijing accelerates efforts to restore maritime access for its northeastern provinces, the northern East Sea is increasingly expected to evolve into a new strategic theater where the China-Russia-North Korea axis collides with the U.S.-Japan security network.

China and Russia Agree to Consult North Korea on East Sea Access via Tumen River

According to China’s state-run Xinhua News Agency on May 22, Chinese President Xi Jinping and Russian President Vladimir Putin signed a joint statement following summit talks at Beijing’s Great Hall of the People on May 20, pledging expanded cooperation across the economy, culture, military affairs, and transportation infrastructure. In the statement, both sides declared that “in accordance with the 1991 agreement on the eastern section of the border, trilateral consultations with the DPRK regarding access to the sea through the Tumen River will continue.” Because the lower reaches of the Tumen River border Russian territory, China cannot utilize the route without Russian cooperation.

The two sides also agreed to deepen cooperation under the framework of the Greater Tumen Initiative (GTI), strengthening collaboration among member states in trade and investment, transportation, energy, the digital economy, agriculture, tourism, and environmental cooperation to promote broader regional integration in Northeast Asia. GTI is a multilateral regional development platform centered on the lower Tumen River involving South Korea, North Korea, Mongolia, China, and Russia. For Moscow, a successful GTI framework could accelerate investment inflows into Russia’s Far East, particularly Primorsky Krai adjacent to the Tumen River basin.

In addition, both countries agreed to construct a new border crossing at Heixiazi Island in Heilongjiang Province and expand rail freight transportation linking China with Russia and Europe. Broader transportation and logistics cooperation, including Arctic shipping routes and the China-Mongolia-Russia economic corridor, is also set to intensify. In the energy sector, cooperation will continue across oil, gas, coal, nuclear power, and renewable energy. Beyond this, China and Russia pledged broad-based economic cooperation spanning automobiles, shipbuilding, civil aviation, the digital economy, artificial intelligence (AI), e-commerce, mineral development, agriculture, finance, customs, standardization, and intellectual property rights, while simultaneously strengthening military and security cooperation through expanded joint exercises and coordinated maritime and aerial patrols.

Tumen River, Scar of China’s Modern Defeat, Reemerges as Maritime Strategic Axis

For decades, China has pursued efforts to open sections of the Tumen River to Chinese commercial shipping. Discussions surrounding development of the river estuary began during the “Northern Boom” of the early 1990s following the end of the Cold War, when enthusiasm for investment and economic cooperation with former communist bloc states surged, but little concrete progress followed. Momentum resurfaced last November when Yanbian University hosted the 15th Tumen River Forum, followed by a series of GTI-related meetings in December that elevated lower Tumen River development back onto Beijing’s strategic agenda.

Despite possessing approximately 11,200 miles of coastline stretching from the South China Sea to the Yellow Sea, China still lacks direct maritime access to the East Sea from its northeastern region. The loss of access dates back to the geopolitical collapse that unfolded before China’s defeat in the First Sino-Japanese War during the 19th century. Following defeat in the Second Opium War in 1860, the Qing Dynasty ceded Primorsky Krai to Russia under the Convention of Beijing, losing control over the Far Eastern coastline including Vladivostok. Russia subsequently expanded its military and port infrastructure across the Far East to secure year-round warm-water access, while China’s northeastern maritime access steadily contracted. After the Qing defeat in the First Sino-Japanese War in 1894, Beijing also lost influence over the Korean Peninsula, solidifying a regional order in which Japan and Russia divided maritime dominance in Northeast Asia. The lower Tumen River was ultimately absorbed into the North Korea-Russia border system, leaving Jilin Province geographically adjacent to the sea yet structurally trapped without its own maritime outlet.

Another factor elevating the Tumen River’s strategic importance within China is energy security. Although China is a major producer of coal, oil, and natural gas, its vast manufacturing base depends heavily on imported energy supplies. The vulnerability lies in Beijing’s excessive dependence on the world’s four major maritime chokepoints. Roughly 70% to 80% of China’s maritime cargo volume and as much as 90% of its energy imports pass through at least one of the Strait of Malacca, Strait of Hormuz, Suez Canal, or Panama Canal.

In particular, Middle Eastern oil and gas shipments, which account for nearly half of China’s total imports, must transit both the Strait of Hormuz and the Strait of Malacca before reaching the Chinese mainland. China’s energy lifelines are therefore effectively exposed to maritime corridors dominated by U.S. and allied naval forces. At the same time, the lower Tumen River offers China a strategic logistics corridor capable of reducing transportation costs across the three northeastern provinces while linking Hunchun, Yanji, and Changchun with Russia’s Far East and North Korea’s Rason Special Economic Zone. Northeast China has historically suffered from limited maritime trade access, constraining economic development. Should Beijing secure a trade corridor through the Tumen River into the East Sea, the route could evolve into a strategic hub connecting future Arctic shipping lanes alongside broader export logistics networks.

China’s Northern Expansion Under U.S. Alliance Pressure Tests Northeast Asian Security Order

Maritime access extends far beyond commercial trade routes. Opening the lower Tumen River would simultaneously create potential pathways for Chinese surveillance, reconnaissance, coast guard operations, and military logistics. This explains why Beijing increasingly frames the Tumen River issue not as a simple logistics challenge but as a lingering symbol of China’s lost maritime dominance during the modern era. The Xi leadership’s recent integration of the Northeast Revitalization Strategy with its broader maritime power agenda reflects a long-term national strategy aimed at restoring the northeastern naval discontinuity imposed since the 19th century.

At the same time, Washington has recently intensified efforts to constrain Chinese naval operations through closer coordination with Japan, the Philippines, and Taiwan, while expanding cooperation on nuclear-powered submarines, underwater surveillance systems, and advanced military technologies through AUKUS, the trilateral security partnership involving the United States, Australia, and the United Kingdom. Against this backdrop, Beijing’s need for alternative maritime maneuvering space has grown increasingly urgent. According to leading think tanks including the Center for Strategic and International Studies (CSIS) and the Australian Strategic Policy Institute (ASPI), China currently faces mounting pressure from the U.S.-led alliance network across the South China Sea, East China Sea, and Taiwan Strait. Should Beijing secure a new access corridor toward the northern East Sea, China’s naval operational radius and intelligence-reconnaissance capabilities could extend deeper into northeastern waters.

The strategic character of the northern East Sea may also undergo profound transformation. Historically, the region represented a contested space involving South Korea, Japan, Russia, and North Korea. However, direct Chinese maritime access could reshape it into a multilateral maritime competition zone where the U.S.-Japan alliance intersects with China-Russia-North Korea coordination, according to a growing consensus among security experts. Japan would likely have little choice but to reinforce surveillance networks around Hokkaido and the northern East Sea, while South Korea could also face sharply heightened military sensitivities across northern East Sea waters.

Most critically, if China secures access rights to the lower Tumen River, the East Sea could evolve into an entirely new frontline theater for Chinese and Japanese naval confrontation. According to Japan’s Ministry of Defense, Chinese naval warships have increasingly entered the East Sea while Chinese intelligence-gathering vessels have made repeated transits through the Tsushima Strait. In March alone, a Chinese Dongdiao-class electronic surveillance vessel reportedly entered the East Sea via the Tsushima Strait. Beyond this, Chinese and Russian naval forces conducted the “Joint Sea-2025” exercise near Vladivostok in the East Sea last August, including anti-submarine warfare, air defense, and anti-ship combat drills, alongside the first-ever joint submarine patrol by the two countries in the East Sea.

Within this evolving environment, opening navigation rights along the lower Tumen River would significantly expand China’s operational foundation for electronic warfare, submarine rescue operations, anti-submarine warfare, and joint naval maneuvering in the northern East Sea. For Japan, this would extend defense burdens beyond Okinawa, the Miyako Strait, and waters east of Taiwan toward Hokkaido and the northern East Sea. If the Chinese navy secures not only the traditional route through the Korea Strait into the East Sea but also a northern access corridor, Japan could face simultaneous multi-front surveillance pressure spanning the Tsugaru Strait, Soya Strait, and the northern East Sea.