Ukraine said dozens of people died and many more were wounded in a rocket strike at a railway station packed with civilians fleeing fighting and a threat of a major Russian offensive in the country's east.

As regional authorities rushed civilians out of harm's way, European Union leaders arrived in Kyiv to offer Ukrainian President Volodymyr Zelenskiy support and reassurance that there will be a path to EU membership for Ukraine.

Pavlo Kyrylenko, governor of the Donetsk region where the Kramatorsk station is located, said at least 39 people were killed and 87 wounded, with many in serious condition, in what he described as a deliberate attack by Russian forces.