Testing Beijing, Japan eyes growing role in South China Sea security

A crewman from the Vietnamese coastguard ship 8003 looks out at sea as Chinese coastguard vessels give chase to Vietnamese ships that came close to the Haiyang Shiyou 981, known in Vietnam as HD-981, oil rig in the South China Sea in this July 15, 2014 file photo. REUTERS/Martin Petty/Files

TOKYO (Reuters) - Seventy years after its imperial forces were kicked out of the South China Sea, Japan is quietly moving back into the region, forging security ties with the Philippines and Vietnam as both Southeast Asian nations try to cope with China's territorial ambitions.

Tokyo's security cooperation is broad-based: It is supplying maritime patrol boats to the two countries while Japan will hold its first naval exercises with the Philippines in the coming months. Japanese military doctors are even advising Vietnamese submariners on how to deal with decompression sickness.