North Korean leader Kim Jong Un expressed his unwavering support for Russia’s aggression against Ukraine during a meeting with a top Russian security official in Pyongyang, North Korean state media said Saturday.

A top Russian security official has met North Korean leader Kim Jong Un in Pyongyang, thanking him for the country’s support of Moscow’s war efforts in Ukraine, Russian state media said. The meeting came after reports that North Korea recently sent additional troops to Russia to aid its war efforts.

A team of high-level Russian diplomats is visiting Pyongyang, but their mission in the North Korean capital is unknown.