In a potential sign of further disintegration of China and North Korea’s once-close relationship, China has launched a formal complaint against the Hermit Kingdom after a North Korean allegedly killed four Chinese nationals. On Dec. 27, a deserter from the North Korean army broke across the border and killed four Chinese people during a robbery in Helong, according to the Chinese government. Chinese officials caught the solider and shot him in the stomach the same day, but chose not to announce the incident or its formal complaint with Pyongyang until Monday. The suspect remains unconscious in China. Relations between the two countries have turned increasingly chilly under the reign of Kim Jong Un.