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

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 Carl Vinson is the first U.S. carrier to visit Busan since the USS Theodore Roosevelt docked there on June 24. Days later, the Theodore Roosevelt and its strike group took part in Freedom Edge, the first major trilateral maritime and aerial exercise involving the United States, South Korea and Japan.