File photo of crew members of a South Korean destroyer firing an anti-submarine torpedo during military drills in the Yellow Sea of South Korea

 
File photo of crew members of a South Korean destroyer firing an anti-submarine torpedo during military drills in the Yellow Sea of South Korea
Crew members of a South Korean destroyer fire an anti-submarine torpedo during military drills in the Yellow Sea of South Korea in this August 5, 2010 file photo. Indonesia is buying submarines from South Korea and coastal radar systems from China and the United States. Vietnam is getting submarines and combat jets from Russia, while Singapore - the world's fifth-largest weapons importer - is adding to its sophisticated arsenal. Picture taken August 5, 2010. REUTERS/Song Kyung-suk/Poo/Files