North Korean leader Kim Jong Un will visit Russia within days, both countries confirmed Monday, with the two leaders expected to discuss a potential arms deal amid Moscow's deepening isolation over the war in Ukraine.

The Kremlin said in a brief statement that Kim would pay an official visit to Russia "in the coming days" at the invitation of President Vladimir Putin. The North's official Korean Central News Agency said that Kim would visit "soon" to "meet and have a talk with Comrade Putin."

Neither side offered a clear date for the meeting, but South Korean media, quoting government sources in Seoul, reported earlier Monday that Kim's personal armored train appeared to have left Pyongyang bound for the Pacific coast city of Vladivostok.