A wave of overnight Russian missile strikes has killed at least eight people in the capital Kyiv and the surrounding region, Ukrainian authorities say.

Apartment blocks, warehouses, a children’s hospital and a school were hit in the “massive attack” on Thursday, according to the State Emergency Service of Ukraine (DSNS). At least least 33 people were injured in the strikes.

Authorities are scrambling to rescue anyone trapped underneath the rubble of demolished buildings, with crews already pulling two survivors from debris.

Meanwhile, Romania said one drone crossed into its territory at the northern border with Ukraine triggering an air alert siren.

In the early hours of Thursday, “a drone entered Romanian national airspace, approximately 13 kilometres east of the city of Galați,” the Romanian defence ministry wrote in a statement.

The drone crashed into “an uninhabited area”, causing a small fire that was extinguished.

“No casualties or material damage were reported”, the ministry added, noting that the initial alert had been lifted.

The Polish military also said it had begun “defensive air operations” to protect its airspace, with the country sharing part of its south-eastern border with Ukraine.