China rebuffed U.S. pressure to curb its activity in the South China Sea on Sunday, restating its sovereignty over most of the disputed territory and saying it "has no fear of trouble.

On the last day of Asia's biggest security summit, Adm. Sun Jianguo said China will not be bullied, including over a pending international court ruling over its claims in the vital trade route.

"We do not make trouble, but we have no fear of trouble," Sun told the Shangri-La Dialogue in Singapore, where more than 600 security, military and government delegates had gathered over three days.