Buses and cars have evacuated large numbers of civilians from the besieged eastern Ukrainian city of Sumy but authorities in Kyiv accused Moscow of shelling a similar refugee corridor meant to allow residents to escape the devastated port of Mariupol.
As the number of people fleeing Ukraine passed 2 million and the World Health Organization (WHO) warned that the country was running out of vital medical supplies, the government in Kyiv said Russia had broken an agreed ceasefire.
