Separately, Ukraine revealed more details about the first two North Korean soldiers it has captured alive and said it was willing to exchange them for Ukrainians held in Russia.

Ukraine has found “irrefutable evidence” of North Korea’s involvement in Russia’s war against his country, president Volodymyr Zelensky said this week as he announced the capture of two North Korean soldiers.

Ukraine captured two wounded North Korean soldiers who were fighting on behalf of Russia in a Russian border region, South Korea’s intelligence service said.