The powerful sister of North Korean leader Kim Jong Un has threatened a high-profile response to the arrival of a U.S. aircraft carrier in South Korea and other U.S. military activities

Kim Yo-jong made the condemnation as the USS Carl Vinson, a Nimitz-class U.S. aircraft carrier, entered a key naval base in the southeastern city of Busan on Sunday, as part of the U.S. commitment to providing extended deterrence against North Korean threats.

The fresh deployment comes after North Korea suffered heavy casualties on the front lines in Russia’s war against Ukraine, the South’s spy agency says.

The aircraft carrier’s visit was part of the “ironclad” commitment of the United States to extended deterrence and to show readiness by the military alliance between Seoul and Washington against North Korea,

The USS Carl Vinson aircraft carrier arrived at a key naval base in the southeastern city of Busan on Sunday, South Korea's Navy said, reaffirming the U.S. commitment to extended deterrence against continued North Korean threats.