Russia says its troops had abandoned key bastion of Lyman in occupied eastern Ukraine, a stinging defeat that prompted a close ally of President Putin to call for the possible use of low-grade nuclear weapons on day 220 of fighting.
Russia stepped up its assault on Ukrainian city of Sievierodonetsk after claiming to have captured nearby rail hub of Lyman, as Kiev calls for longer-range weaponry from West to fight in Donbass as the conflict enters 95th day.
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