At least four people died overnight as Russian drone and missile strikes continued to pound Ukraine’s towns and cities, local officials said Saturday. Meanwhile, Moscow’s troops continued their grinding advance through the country’s east.

Russia launched a barrage of drones and missiles on Ukraine on Saturday, killing at least four civilians and damaging residential buildings and infrastructure across the country, Ukrainian officials said.

A new drone bomber may have joined Ukraine’s escalating assault on Russia’s oil industry. On Wednesday night or early Thursday morning, drones operated by the Ukrainian 14th Separate Unmanned Aerial Vehicle Regiment struck a pumping station on the Druzhba pipeline along the Russian-Belarusian border in Bryansk Oblast.