South Korean air force fighter planes participate in a drill in this picture taken and released by the air force in Seoul

 
South Korean air force fighter planes participate in a drill in this picture taken and released by the air force in Seoul
South Korean air Force fighter planes participate in a drill in this picture taken and released by the air force in Seoul February 14, 2013, after North Korea on Tuesday conducted its third nuclear test. REUTERS/South Korean air force/Handout