The Russian army has brought more than half of the long-contested city of Toretsk in eastern Ukraine under its control, a Ukrainian official said on Friday. “Roughly 40 to 50% of the city is under the control of the Ukrainian armed forces. The rest of the city is occupied by the enemy,” the head of the city’s military administration, Vasyl Chynchyk, told Ukrainian television news. A further Russian advance was prevented on Thursday, he said. Of the former population of over 30,000, around 1,150 people are still said to be holding out in the heavily destroyed city. Russian troops already contro…