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 powerful sister of North Korean leader Kim Jong-un on Tuesday warned of a stepped-up action against the arrival of a U.S. aircraft carrier in South Korea, claiming that the U.S. move highlights the North's urgency to bolstering its nuclear forces.

A U.S. aircraft carrier has arrived in South Korea in a show of force, days after North Korea test-launched cruise missiles to demonstrate its counterattack capabilities.