Chinese tourists to Vietnam sporting T-shirts with a map of China showing the 9-dash line arrived in southern Cam Ranh airport on May 13 night and were stopped by security at the Immigration desk. A Vietnam Immigration officer was quoted by South China Morning Post as saying “We asked them to take the T-shirts off before allowing them to leave the airport.” Photos of the tourists in their nationalist attire were widely circulated on social media -- with the nine-dash line crossed out with an “X” -- and attracted criticism from netizens who said the tourists were not welcome in Vietnam and should be deported.

(Comment: The so-called nine-dash line is the sea boundary found on some 1940s-era maps which Beijing says proves its claim to most of the waterway, despite partial claims from Vietnam and other nations.)