A Russian drone struck a multi-storey apartment building in the northeastern Ukrainian city of Sumy early on Thursday, killing nine people and injuring 13, including a child, President Volodymyr Zelenskiy said.

The drone blew out a wall and surrounding windows in the building in Sumy, a major city, just after 1 a.m., the Sumy regional administration 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.