Ukrainian President Volodymyr Zelenskiy has cited intelligence about the preparation of two units with possibly up to 12,000 North Korean troops who would take part in the war alongside Russian forces.
DPRK stands for the North's official name, the Democratic People's Republic of Korea.
Russia's Foreign Ministry has threatened South Korea with "security consequences" if it helps Ukraine in its war against Russia.
This has included concerns over what Seoul says is a dispatch of North Korean troops to Russia to fight in Ukraine, a claim that has been denied by Pyongyang.