US President Joe Biden used his visit to Cambodia this weekend for the Association of South-East Asian Nations (ASEAN) summit to ask his host if Chinese activity at a Cambodian naval base should be a source of concern. Biden “underscored the importance of full transparency about activities by the [People’s Republic of China] military at Ream Naval Base,” in a conversation with Cambodian Prime Minister Hun Sen, according to a White House statement. According to unconfirmed media reports, Cambodia has allowed Chinese forces access to part of the base on the Gulf of Thailand. The terms of the sec…