March 14 (UPI) -- Ukraine and Russia traded attacks overnight with at least a dozen people injured, four of them children, in Russian drone and artillery strikes on Ukraine's northeast and Ukraine targeting Moscow for the second time in three days and a major Black Sea oil refinery in southern Russia. Several explosions were heard in three districts of Kharkiv on Thursday night, after Russian attack drones targeted the city injuring two women, a man, and four children , and setting a house and