Kyiv, April 7 -- A Russian drone attack on Ukraine's southern port city of Odesa killed two women and a toddler, authorities said on Monday, while Ukrainian long-range drones targeted Russia's key Black Sea port for oil exports. The nighttime attack on Odesa heavily damaged an apartment block, killing the women and a 2-year-old child, officials said. Rescuers working under floodlights pulled four people from the rubble. Eleven people were hospitalised, including a pregnant woman and two children - the youngest less than a year old, Ukrainian President Volodymyr Zelensky said in a post on X. Russia has pounded civilian areas of Ukraine since it invaded its neighbour just over four years ago, killing more than 15,000 people, according to the United Nations. It has also taken aim at Ukraine's power grid, and the Russian overnight barrages also hit energy infrastructure in the Chernihiv, Sumy, Kharkiv and Dnipro regions, Zelenskyy said. More than 300,000 households were without electricity in the northern Chernihiv region after distribution facilities were damaged in attacks, according to the regional power utility. Ukraine has fought back by developing its own long-range drones, which now reach targets some 1,500 kilometres inside Russia.Ukraine has used them recently to hammer Russian oil facilities.Russia's Defence Ministry said that air defences downed 50 Ukrainian drones overnight....