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STORY: In a late night address, he also said Ukraine needed modern anti-missile weapons now, adding there could be no justification for partner countries to delay delivery. Some Russian rockets are evading defences and causing casualties, he said.

Ukraine said its forces were still trying to evacuate civilians from Sievierodonetsk after Russia destroyed the last bridge to the city, the latest stage in a weeks-long battle in the Donbas region that Moscow seeks to capture.

Both sides claim to have inflicted huge casualties in the fighting over the city, Russia's principal battleground focus.

The battle for Sievierodonetsk - a city of barely more than 100,000 people before the war - is now the biggest fight in Ukraine as the conflict has shifted into a war of attrition.