bbc.com US President Barack Obama has accused Russia of being responsible for the violence in eastern Ukraine. He said the fighting was not the result of a home-grown uprising but of "deep Russian involvement", and new satellite images made its role clear. Russia denies Nato claims that more than 1,000 Russian troops are fighting with pro-Russia separatists. It accuses Ukraine of attacking its own people. More than 2,000 people have been killed in four months of fighting. Nato is to hold an emergency meeting on Friday to discuss the crisis. It follows Thursday's emergency meeting of the United Nations Security Council in New York. to read more: bbc.com
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