A White House photo of Japanese Prime Minister Sanae Takaichi appearing to break into a dance at an official function ignited a wave of mockery across Chinese social media on the weekend, with commenters framing her as Washington’s biggest cheerleader.The photograph, the first in an official White House gallery from her summit with US President Donald Trump on Thursday, captures Takaichi in a moment of unbridled exuberance during a welcome reception.Making her first trip to Washington since...