https://cdnph.upi.com/ph/st/th/9001786423214/2026/upi/4612004cb9b3de17d8ca1a981f787c8b/v1.5/Zelensky-says-Russia-war-is-strengthening-North-Korea-military.jpg" /> Ukrainian President Volodymyr Zelensky warned Monday that North Korea is gaining battlefield experience and improving its military capabilities through its support for Russia.