Officials say a Russian drone has blasted a hole in an apartment building in northeastern Ukraine during a nighttime attack, killing at least four people and injuring nine others

Ukraine has targeted two of Russia's oil refineries in drone strikes in an effort to bankrupt their ability to continue funding the war.

Four Ukrainian drones hit Russia's Lukoil refinery early Wednesday morning causing fires and significant damage, according to Ukraine's military intelligence. It comes days after Russia's Ryazan oil refinery was hit.