Ukrainian prosecutors are investigating Russia’s use of a presumed North Korean missile as part of a probe into war crimes, in a move that experts said could lead to international war crime charges against Pyongyang if it knew how the weapons would be used.

Ukraine’s prosecutor general Andriy Kostin stated on Friday that a preliminary examination of a missile fired at the city center of Kharkiv in the early morning of Jan. 2 was “a short-range missile developed by North Korea,” echoing U.S. assessments that Russia fired multiple DPRK missiles at Ukraine from late December to early January.