Russian authorities on Sunday said a Ukrainian drone attack caused several explosions in the southern Russian region of Voronezh, sending plumes of smoke rising into the sky. The governor of the region, Alexander Gusev, said on the messaging service Telegram that objects containing explosive material had detonated after Ukrainian drones were shot down near Podgorenski, south of the regional capital Voronezh. Ukrainian news portal Ukrainska Pravda reported that a 9,000-square-metre depot storing Russian army rockets, tank ammunition and artillery shells was hit. Russian authorities did not conf…