No sign of casualties at site of strikes Russia says killed hundreds of Ukrainian soldiers- Summary- No sign of casualties at site of the strike - witness- Russia says it carried out revenge attack on Ukraine- Claims it killed over 600 Ukrainian troops- No immediate response from UkraineKRAMATORSK, Ukraine, Jan 8 (Reuters) - A Russian rocket strike on the Ukrainian city of Kramatorsk caused damage but did not destroy buildings and there were no obvious signs of casualties, a Reuters witness said on Sunday, after Russia said the attack killed 600 Ukrainian soldiers.Reuters reporters visited the two college dormitories Russia's defence ministry said had been temporarily housing Ukrainian servicemen close to the front line of the war at the time of the overnight strike.Ukraine was believed to have stopped housing troops close together in single facilities after a deadly Russian missile strike on a base in western Ukraine in March which killed dozens.The practice of housing soldiers all together came into focus too after the Ukrainian strike on Makiivka this month with Russian military commanders subject to fierce criticism inside Russia for not dispersing their forces.Ukrainian officials earlier said at least two people had been killed elsewhere in Russian overnight bombing after a unilateral Russian Orthodox Christmas ceasefire had expired."