US aircraft carrier starts drill with South Korean navy

The US aircraft carrier USS Carl Vinson on Saturday kicked off a joint drill with the South Korean navy, officials said, as tensions rose over North Korea's latest test-fire of a ballistic missile."Immediately after the aircraft carrier arrived in the Sea of Japan, South Korea and the US strike forces launched a drill from 6:00 pm (0900 GMT) Saturday", a defence ministry spokesman told AFP.The drill came hours after the North launched a ballistic missile in apparent defiance of a concerted US pu