The Emerging Shape Of China's Military Reach In SE Asia

The China-backed Ream naval facility in Cambodia, which includes a pier, dry dock and other naval-support infrastructure, has improved Beijing's maritime access in Southeast Asia and given it a potentially valuable southern flank vis-a-vis the US in the South China Sea.

The Ban Keun facility adds an aviation component to the network. Maritime access in Cambodia and air access in Laos serve different purposes but the same aim: reducing the geographical constraints on Chinese military operations beyond its borders.

None of this means China is preparing for war. But Beijing is accumulating strategic options as its competition with the US for regional influence intensifies.

The military development has piggybacked on China's Belt and Road Initiative (BRI). The China-Laos Railway, backed by the infrastructure-building scheme and opened in December 2021, has grown from a bilateral project into a regional logistics corridor.

By August 2026, Chinese state media claimed it had carried more than 21 million metric tons of cross-border cargo on more than 23,000 freight trains. Cargo shipped by rail from China to Laos now reaches at least 19 countries, including Thailand, Vietnam, Cambodia, Malaysia and Singapore, state media said. In the first half of 2026 alone, trade carried on the line was worth 17.17 billion yuan, up 33.8% from a year earlier.

The railway is not a military project, and insinuating as much would be hard to substantiate. But as roads, railways, energy links, commercial networks and institutions deepen through the BRI, the barriers to China-Laos military cooperation are falling as well.

Laos is now much more than a landlocked, underdeveloped country wedged between China, Vietnam and Thailand. It is increasingly a strategic hinterland through which Chinese economic, political and security interests move without geographic barriers.

To be sure, the relationship's power dynamics are lopsided. The International Monetary Fund estimates that Chinese institutions are Laos's largest creditors, and the country remains in external and overall debt distress.

At the end of 2024, Chinese creditors held about 32.4% of Laos's public and publicly guaranteed external debt. The IMF also notes that debt-service payments to China have repeatedly been deferred, including US$427 million in principal payments in 2024.

That does not necessarily mean China controls Laos or leveraged this economic disparity to push for access to the Ban Keun facility.

But it describes the setting in which military cooperation can deepen. Economic dependence, infrastructure links and defense ties now run on the same rails of the uneven bilateral relationship. Ban Keun adds a security layer to a partnership that already has developed considerable economic weight.

The most important question is not what China can do from Ban Keun today but what lasting access could allow it to do later.

Geographically, the site sits close to Thailand, in the space linking Yunnan with mainland Southeast Asia and within reach of a region where Beijing already has extensive economic and military ties.

Thailand is a US non-NATO treaty ally that also maintains defense ties with China. The depth of those ties has come under scrutiny after Thailand's recent border clashes with Cambodia, which relies on Chinese-made military equipment and missiles for its defense.

China maintained neutrality throughout the conflict but has transferred new equipment, including corvettes for maritime operations, to Cambodia since the hostilities have died down.

At the same time, neighboring Laos and Cambodia have long been seen as sensitive in Vietnam's strategic calculations, with China supporting armed forces opposed to the Hanoi-installed regime in Phnom Penh throughout the civil war in the 1980s.

Now, Cambodia has become increasingly important to China's maritime strategy, including crucially in the South China Sea vis-à-vis the US. Together, these relationships give China multiple forms of military access without requiring a formal alliance system or permanent bases.

Indeed, China may be building a mainland Southeast Asian air corridor without announcing it. Rather than building what would be a highly controversial network of air bases, it is building up facilities where Chinese personnel can train, aircraft can operate, local forces can become interoperable and logistics can become routine.