A United Nations official said the escalating conflict in eastern Ukraine has displaced more than a million people from their homes, BBC News reported.
In the past three weeks alone, the number of people who left their homes in Ukraine has doubled to at least 260,000, said Vincent Cochetel, Europe director of the UNHCR in Geneva.
Another 814,000 people have crossed the border into Russia this year, he said.
Since fighting between Ukrainian forces and pro-Russian rebels started in April, some 2,600 people have been killed and thousands more wounded, the BBC said.
Separatists in the eastern regions of Donetsk and Luhansk have declared independence after Russia annexed Crimea from Ukraine.
Government forces had besieged Luhansk, but were later forced to retreat as the rebels gained ground.
Rebels have also advanced in Donetsk region, around the city of Donetsk and further south near the port of Mariupol, the report said.
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