A Chinese warship collided with one of its own coast guard vessels while chasing Philippine boats earlier this week in the highly contested South China Sea.

The U.S. Coast Guard reports an increase in activity by Chinese research vessels in and around the U.S. Arctic.

China's coast guard said on Monday it took necessary measures to expel Philippine vessels from waters around Scarborough Shoal in the South China Sea. The coast guard said in a statement it monitored and intercepted the Philippine vessels after they ignored warnings,