North Korea’s entry into Russia’s war against Ukraine is a major escalation in the grinding conflict, but Moscow may find it’s more trouble than it’s worth.

Our correspondent visits Fangchuan, where the borders of China, North Korea and Russia meet. She reflects on growing ties between Moscow and Pyongyang, and where it leaves China. Show more Kate Adie presents stories from China,

The recently signed mutual defense treaty could be used to justify thewidening of the war in Ukraine, as the U.S. says North Korean and Russian troops are already battling Ukrainian forces.