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By Katya Golubkova and Natalia Zinets MOSCOW/KIEV (Reuters) - Moscow threatened Kiev on Sunday with "irreversible consequences" after a man was killed by a shell fired across the border from Ukraine, describing the incident in warlike terms as aggression that must be met with a response. Although both sides have reported cross-border shootings in the past, the incident appears to be the first time Moscow has reported fatalities on its side of the border from the three-month conflict which has killed hundreds of people in Ukraine. Ukraine denied its forces had fired across the border and suggested such an attack could have been the work of rebels trying to provoke Moscow into intervening on their behalf. The bellicose rhetorical response from Moscow raises the renewed prospect of overt Russian intervention, after weeks in which President Vladimir Putin had appeared intent on disengaging, pulling back tens of thousands of troops he had massed at the frontier.