US aircraft carrier arrives in South Korea for military training exercise

The Theodore Roosevelt (CVN 71), a nuclear-powered aircraft carrier is anchored in Busan, South Korea (Song Kyung-Seok/Pool Photo via AP)

A nuclear-powered United States aircraft carrier has arrived in South Korea ahead of a three-way exercise involving South Korean and Japanese forces.

The countries are stepping up their military training to cope with North Korean threats, which have escalated with its alignment with Russia.