(Reuters) – At least three people were killed in a gunfight in the early hours of Sunday near a Ukrainian city controlled by pro-Russian separatists, shaking an already fragile international accord that was designed to avert a wider conflict. The incident triggered a war of words between Moscow and Ukraine’s western-backed government with each questioning the other’s compliance with the agreement, brokered last week in Geneva, to end a crisis that has made Russia’s ties […]