The Russian military is intensifying its attacks on Ukraine’s eastern regions, with airstrikes on Mariupol, Kharkiv and Chernihiv, Ukrainian sources said on Saturday. The airstrikes affected the arms industry and also residential areas in the cities, presidential adviser Olexiy Arestovych told Ukrainian television. This could not be independently verified. Russia denies attacking civilian targets. However, in contrast, Russian soldiers had been pushed towards the state border in the north and north-east, Arestovych said, noting that Ukrainian troops had recaptured more than 30 villages around …