FILE - In this Nov. 12, 2014 file photo, U.S. President Barack Obama, left, shakes hands with his Chinese counterpart Xi Jinping after their press conference at the Great Hall of the People in Beijing, China. As Xi makes his first state visit to Washington this week, the outlook for relations is decidedly murkier than when he hosted Obama at their last summit less than a year ago. Tensions are rising over allegations of Beijing-directed cyberattacks on the U.S. and China’s moves to assert its South China Sea territorial claims. (AP Photo/Andy Wong, File)