BEIJING — While high-profile world leaders in Davos last week opined on U.S. claims to Greenland , China's envoy reiterated calls for cooperation . Businesses and analysts in China said the developments highlighted an opportunity for Beijing to expand its influence globally as tensions between the U.S. and its allies grow. This year's Davos is a "watershed" moment, said Hai Zhao, a director of international political studies at the Chinese Academy of Social Sciences, a state-affiliated think