A massive drone attack on Russia's Tver region to the northwest of Moscow overnight forced authorities to partially evacuate residents of a town and shut schools and kindergartens in a neighboring municipality.

A Ukrainian drone attack launched overnight succeeded in destroying an ammunition depot in the western Russian region of Tver, a source from Ukraine’s Security Service (SBU) told CNN on Wednesday.

Over the past few months, Kyiv has grown in confidence and ambition as it has ramped up drone attacks inside Russia. It’s struck as far as 1,800km (1,118 miles) in the past, when a long-range radar was hit in the city of Orsk.