U.S. President Joe Biden will meet leaders of NATO's eastern flank on Wednesday to show support for their security after Moscow suspended a landmark nuclear arms control treaty.
Russia said on Wednesday it had broken through two fortified Ukrainian defence lines on the eastern front, with Kyiv describing conditions there as difficult and Western allies announcing more military aid including artillery rounds.
War in Ukraine is going on despite Russian leader Vladimir Putin unilaterally ordering his forces to pause attacks for 36 hours for the Orthodox Christmas.