news.donga.com/3/02/20170409/83773504/1
China Times reported on Apr. 9 that China's military deployed two army groups, about150 thousand troops, at Sino-N. Korean border to guard against an unexpected situation, while troops of S. Korea and U.S. have been conducting joint exercises since last month, including decapitation operation to remove Kim Jong-un.
According to China Times Online in Taiwan, the Northern Military District which is in charge of defending North Eastern region of China ordered full battle preparation to all land, sea, and air units under its command, and massed 150 thousand troops out of 430 thousand troops which makes up 16th, 23rd, 39th, and 40th Army Groups.
The news site reported that the Northern District took this measure in response to Key Resolve and Foal Eagle exercises by S. Korean and U.S. troops, which continues until the end of this month, whose scenario is to eliminate N. Korean leadership including Kim Jong-un and destroy N. Korea's WMDs when a crisis breaks out in Korean Peninsula.
The lead units for rapid response to a N. Korean crisis are 39th Army Group and 40th Army Group whose command headquarters are at Yingkou and Jinzhou in Liaoning Province. The 39th Army Group is a heavy mechanized unit and the 40th is the rapid deployment force.
Furthermore, they deployed a new Kongjing-500 early warning aircraft to the border to beef up aerial surveillance
/end translation