Warning: There are distressing images in this report. (Subscribe: https://bit.ly/C4_News_Subscribe)

For thousands of Ukrainians whose homes have become a raging war zone, the chance of escape was fleeting.

A limited agreement to set up humanitarian corridors allowing civilians to leave two embattled cities quickly fell apart this morning, as Russia continued shelling.

Officials said just 400 people had been evacuated from the besieged city of Volnovakha before the Russian attacks resumed.

Médecins Sans Frontières staff in Mariupol described the most bleak and desperate conditions with no power, phone services or heating and people forced to collect snow for water.
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