Ukrainian leaders have warned that Russian forces are intensifying their attacks, especially in the eastern part of the country. They have urged residents to evacuate. Now, a missile attack at a railway station crowded with those trying to escape has killed dozens of people.

The missile hit a crowded train station on Friday morning in Kramatorsk in the eastern province of Donetsk. Authorities say about 4,000 civilians were in and around the station when the missile struck. Most of them were women and children trying to evacuate ahead of Russian forces. The regional governor says at least 50 people were killed -- including five children -- and that nearly 100 were injured.

Ukrainian President Volodymyr Zelenskyy said it was an ordinary train station with ordinary people. He added that there were no military personnel there, just people waiting for a train to get to safe territory.

A Kremlin spokesperson denied that Russian forces were responsible. However, Zelenskyy said Russian troops are too cowardly to fight on the battlefield, so they are resorting to attacks on civilians.

Britain's defence ministry says Russian troops are moving away from areas in the north after being repelled by Ukrainian forces. It says they are advancing south from Izyum, a strategically important city under their control. It expects that the troops that were withdrawn from the north will be redeployed to the east.