US combat ship docks in Vietnam amidst South China Sea tensions.

The US nuclear-powered aircraft carrier Ronald Reagan will make a rare port call in Danang, Vietnam, on Sunday, staying until June 30. This is only the third visit by a US aircraft carrier since the end of the Vietnam War, and comes as tensions with Beijing over boundaries in the South China Sea remain high. The US is seeking to upgrade its formal ties with Vietnam, which frequently disputes with Beijing over the waters.