The inaugural ASEAN-US Maritime Exercise, (AUMX) is underway in Southeast Asian waters this week. The exercise marks the first time that the US and navies from Association of Southeast Asian Nations (ASEAN) member-states have formally worked together. AUMX is taking place on a large area of sea, from the Gulf of Thailand to the Gulf of Tonkin, and south to Singapore. Parts of the exercise are taking place in the South China Sea and this fact could likely worsen the simmering tensions in the region. US and ASEAN officials have stressed that the exercise is not directed at China. No matter if this is the case or not, China will likely regard AUMX as a message being sent its way.
The timing and locations of the exercise has raised some eyebrows. Vietnam and China are currently locked in a standoff over repeated intrusions by Chinese vessels at the energy-rich Vanguard Bank. The Philippines has also been complaining about Chinese intimidation tactics in Manila’s claimed sea areas. More significant, perhaps, are reports that Cambodia has given China an exclusive access agreement to its naval base at Ream on the Gulf of Thailand. If true, Chinese a naval facility could significantly affect the balance of power in the area. Thailand, Vietnam, and India are watching developments closely.