U.S. aircraft carrier USS Ronald Reagan arrives at a South Korean naval base in Busan
U.S. aircraft carrier USS Ronald Reagan arrives at a South Korean naval base in Busan, about 420 km (262 miles) southeast of Seoul, July 14, 2008. The U.S. aircraft carrier made a routine port call in South Korea on Monday, but North Korea usually bristles at such visits, calling them a prelude to invasion and nuclear war. REUTERS/Jo Yong-Hak (SOUTH KOREA)