Daniel Kritenbrink (L), senior director for Asian affairs at the U.S. National Security Council, and Daniel Russel, U.S. assistant secretary of state for East Asian and Pacific affairs, attend a press briefing on preview of U.S. President Barack Obama's travel to China for the G20 summit, in Washington D.C. Aug. 30, 2016. The upcoming meeting between Chinese and U.S. leaders will focus on narrowing and managing differences, and expanding practical cooperation between the two countries, Daniel Kritenbrink told the press briefing. The G20 summit will be held in Hangzhou City, east China, on Sept. 4-5. (Xinhua/Yin Bogu)