U.S. President Barack Obama will host China's President Xi Jinping for a special bilateral meeting on March 31. The encounter will be special because it is the only scheduled bilateral meeting of heads of state during the upcoming U.S.-hosted Nuclear Security Summit of many nations, including U.S. allies. This signifies at once the general and increasing importance of relations between Washington and Beijing, but also the specific need to address rising tensions between the two nations. The prime focus will be on the South China Sea, although other issues should be touched on.u