North Korean casualties: Zelensky 4,000, NIS 3,000, U.S. Department of Defense 1,200 The gap in North Korean casualties in the Sumy region, a Russian border area, was 4,000 for Zelensky, 3,000 for NIS, and 1,200 for the U.S. Department of Defense. The New York Times, which covered the fierce battle for Sumy, 6⁓20 miles inside the Russian border where the worst battle took place at the end, repor..