Paramilitary policemen attend a training session at a military base in Yinchuan, Ningxia Hui Autonomous Region March 13, 2009. Chinese President Hu Jintao urged the military to "staunchly defend" national sovereignty in comments published days after a brief confrontation with a U.S. Navy ship. REUTERS/Stringer (CHINA MILITARY POLITICS) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA