Ukraine war latest: North Korean troops joining Russian assaults in Kursk, Zelensky says
Key developments on Dec. 14-15: * North Korean troops joining Russian assaults in Kursk, Zelensky says * Ukraine destroys Russian train with 40 fuel tanks in Zaporizhzhia Oblast, source claims * 292 front-line clashes recorded over the past day, General Staff reports * Two Russian oil tankers reportedly sink in Kerch Strait * North Korean