UNITED NATIONS — North Korea demonstrated this year that it could produce ballistic missiles and supply them to Russia for use against Ukraine in a matter of months, the head of a research organization that traces weapons used in the war said Wednesday.

Jonah Leff told the U.N. Security Council that researchers on the ground examined remnants of four missiles from North Korea recovered in Ukraine in July and August, including one that had marks indicating it was produced this year.

Leff also had briefed the Security Council in late June, telling members that the organization he heads, Conflict Armament Research, had “irrefutably” established that ballistic missile remnants found in Ukraine early this year were from a missile manufactured in North Korea.

The U.K.-based organization, which was established in 2011 to document and trace weapons used in conflicts to assist governments in countering diversion and proliferation, has worked in Ukraine since 2018.

— The Associated Press