Vietnamese border guards watch the US Seventh Fleet's USS Blue Ridge entering Tien Sa port as Vietnam welcomes the port call of three US naval ships including the guided missile destroyer USS Chafee and the rescue and salvage ship USNS Safeguard in the central city of Danang on April 23, 2012. Vietnam and the US will hold five days of "non-combatant" naval exchane activities next week in the port city of Danang amid rising tensions in the South China Sea with China whose authorities have just released 21 Vietnamese fishermen who were detained seven weeks ago near disputed islands in the South China Sea, drawing strong protests from Hanoi. AFP PHOTO/HOANG DINH Nam (Photo credit should read HOANG DINH NAM/AFP/Getty Images)
