China's Vice Premier Liu He shakes hands with U.S. Treasury Secretary Steven Mnuchin as Yi Gang, governor of the People's Bank of China (PBC) and U.S. Trade Representative Robert Lighthizer stand next to them as they pose for a group photo at Diaoyutai State Guesthouse in Beijing, China March 29, 2019. Nicolas Asfouri/Pool via REUTERSWASHINGTON…