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. The visit comes amid high tensions with Beijing in the South China Sea, where China claims almost all the waters, including the exclusive economic zones of Vietnam and other countries in the region. The US is seeking to upgrade its formal ties with Vietnam, which frequently disputes with Beijing over boundaries in the South China Sea.