MOSCOW, May 13 (Reuters) - Ukraine resumed drone attacks on Russia's oil refineries and ports on Wednesday, two days after a three-day ceasefire proposed by U.S. President Donald Trump expired. Ukraine has been targeting Russian oil infrastructure to undercut Moscow's revenues from the energy sector and dent its military might as the four-year war grinds on.

Russia launched hundreds of drone strikes at Ukraine overnight, hitting a kindergarten and killing at least one as both sides’ fragile three-day ceasefire came to a sudden end, Ukrainian officials announced Tuesday.

Russia and Ukraine reported fighting along their front line despite agreeing to a ceasefire from May 9 to May 11 as part of a Trump-led push for peace.

Russia's Defense Ministry reports that air defenses shot down 347 Ukrainian drones overnight. This major attack comes after Moscow rejected Kyiv’s ceasefire earlier in the week.

Russia and Ukraine swapped accusations of breaking a U.S.-brokered ceasefire on Sunday, with both sides claiming to have suffered casualties in drone and artillery strikes over the past 24 hours. President Trump had announced Friday that Russia and Ukraine would swap 1,

Russia and Ukraine swapped accusations of breaking a U.S.-brokered ceasefire on Sunday, with both sides claiming to have suffered casualties in drone and artillery strikes over the past 24 hours.

With counter-drone technology losing effectiveness, Russia and Ukraine are shifting to deep strikes on each other's drone production sites to destroy them before launch.

New satellite imagery reveals anti-drone protections around Russian nuclear submarines, suggesting commanders fear that Ukrainian surprise attacks threaten even their most remote naval assets.