'Many dead' in Ukraine offensive
Many pro-Russia rebels have been killed, injured and arrested in the Ukrainian government offensive in the eastern city of Sloviansk, interim president Oleksandr Turchynov has said.
But, in a statement, he said the operation in the rebel-held city was not going as quickly as hoped.
Earlier, rebels shot down two Ukrainian army helicopters, killing a pilot and a serviceman.
Russia has called for an emergency meeting of the UN Security Council.
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