An overnight Russian strike on Sumy killed seven people, including a child, Volodymyr Zelensky said on Tuesday morning.

A drone hit a residential building in the small town of Hlukhiv in the Sumy border region, the Ukrainian president said, adding that more victims may be stuck under rubble.

The attack came as Ukraine marked the 1,000th day since Russia’s full-scale invasion and just hours after 11 people were killed and dozens more injured in a separate attack on the northeastern Sumy region.

Russia has intensified its attacks on Ukraine in recent days, targeting the country’s critical energy infrastructure ahead of what is expected to be a harsh winter. 

In the Black Sea port of Odesa on Monday, a Russian missile attack killed 10 people and wounded 44.

Moscow’s intensifying attacks come as Joe Biden looks set to approve Ukraine’s use of British Storm Shadow missiles to strike targets inside Russia. It would follow the US president’s decision to lift restrictions on Kyiv’s use of Atacms rockets.