Russian forces targeted Ukraine's energy and gas infrastructure in a "massive" nighttime missile attack and Ukrainian drones struck an important oil refinery inside Russia, officials said Tuesday, as the near three-year war rumbled on against a backdrop of renewed diplomatic efforts to end it.

Overnight Russian drone attacks sparked a fire in Kyiv and injured a woman and damaged several houses in the northeastern city of Sumy, Ukrainian officials said on Monday. The Ukrainian military said on Monday that it had shot down 61 out of 83 drones with 22 more likely downed by electronic warfare.

Russian drone attacks caused a fire in Kyiv, injured a woman in Sumy and damaged several homes, according to Ukrainian officials. Meanwhile, the Russian military reported downing 15 Ukrainian drones overnight, including seven in the Krasnodar region.