KYIV: Russian drone attacks on power facilities in northern and southern Ukraine overnight left nearly 60,000 customers without electricity, with President Volodymyr Zelenskyy vowing to retaliate by ordering more strikes deep inside Russia. Three and a half years into the war, Russia and Ukraine have both intensified airstrikes in recent weeks. Russia has targeted Ukraine's energy and transport systems, while Ukraine has been attacking Russian oil refineries and pipelines. "We will continue our