Nato accused Russia of “reckless” behaviour and said it would defend “every inch of Allied territory” after Romania said a Russian drone crashed into an apartment building during an attack on neighbouring Ukraine.

Romania’s defence ministry said radar systems had tracked a Russian drone entering Romanian airspace overnight before it struck a 10-storey apartment block in Galati, near the Ukrainian border.

A woman and a child suffered minor injuries, according to Romanian authorities.

Images from the scene showed charred and damaged brickwork on the roof of the building. Officials said the drone exploded on impact, tearing through a top-floor flat.

The incident has raised fresh concerns about the spillover of Russia’s war on Ukraine into Nato territory.