美济礁
China was also reported to have planted buoys in nearby Sabina Shoal. The Philippines claimed that China had a well-rehearsed routine when laying claim to a new reef: first put down buoys, then build concrete markers. Temporary wooden or bamboo shelters followed, and then permanent structures went up. The Philippines therefore would try to destroy the buoys or markers before China has time to build larger structures. The Philippines' decision not to destroy the Chinese structures on Mischief Reef has prevented an escalation of the dispute. The Philippines claims that China has always been prepared for armed conflict when challenged, as is evident in China's defense of reefs from Vietnam in the 1988 Johnson South Reef Skirmish which resulted in more than 70 Vietnamese deaths.