Cao Xin is a senior researcher at The Charhar Institute, a Beijing-based think tank.
Tariffs and weaker military guarantees likely to irk nations long dependent on the U.S.

Then U.S. President Donald Trump and China's President Xi Jinping shake hands after making joint statements at the Great Hall of the People in Beijing on Nov. 9, 2017. © Reuters
Cao Xin is a senior researcher at The Charhar Institute, a Beijing-based think tank.