Relations between Russia and North Korea have been flourishing in recent years, with North Korea supplying troops and ammunition to support Russia’s war against Ukraine in return for military and economic assistance.

The warning comes as the US, South Korea, and Japan continue to expand trilateral military exercises in response to Pyongyang’s growing nuclear arsenal.

South Korea, Japan and the United States conducted a joint air drill on Friday involving a U.S. B-52 strategic bomber and fighter jets of the two U.S. allies over international waters, Yonhap news reported,