May 23 (UPI) -- A Ukraine drone hit a Russian dormitory killing at least 18 overnight in Starobilsk in the Luhansk region, Russian President Vladimir Putin said Saturday. But Ukraine's military said it hit a military drone unit target. There were 42 others injured, and three other people may be trapped under rubble, the BBC reported . Putin called the attack a "terrorist strike," and said the hit was deliberate, Al Jazeera reported . Related At least 7 killed, more than 50 hurt as Russia,