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.

A major Ukrainian drone attack on Russia triggered a giant blast and forced the partial evacuation of residents near the site of a large Russian arsenal in the Tver region on Wednesday, war bloggers and some media reported.

A Ukrainian drone attack caused a massive explosion at a Russian ammunition depot in the Tver region. The explosion was reported to be so powerful that it resembled the detonation of 200-240 tonnes of high explosives.