A China Coast Guard ship (bottom) and a Philippine supply boat engage in a stand off as the Philippine boat attempts to reach the Second Thomas Shoal, a remote South China Sea a reef claimed by both countries, on March 29, 2014. The Philippine ship finally slipped past the Chinese blockade to reach Second Thomas Shoal, where a handful of Filipino marines are stationed on a Navy vessel that has been grounded there since 1999 to assert their nation's sovereignty.              AFP PHOTO / Jay DIRECTO        (Photo credit should read JAY DIRECTO/AFP/Getty Images)