The U.S. aircraft carrier USS Carl Vinson arrived at the southern port city of Busan in South Korea on Sunday as a show of force against North Korea, South Korea's navy said.It is the first U.S. aircraft carrier to dock at a South Korean port since U.

The presence of a U.S. aircraft carrier in South Korea this week highlights the strengthening bilateral alliance, a U.S. admiral said Monday, a day after its arrival in the southeastern city of Busan.

The Carl Vinson Carrier Strike Group arrived in South Korea only days after Pyongyang carried out its fourth missile test this year.