Eight warships, four aircraft and more than 1,000 personnel from the US and 10 Southeast Asian countries will join maritime drills kicking off on Monday, as part of a joint exercise extending into the flashpoint South China Sea.The first Asean-US Maritime Exercise (AUMX) between the regional bloc and Washington lasts for five days, starting at the Sattahip Naval Base in Thailand and ending in Singapore.The drills coincide with stepped-up US engagement in the region and tensions between Beijing…