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.

Russia said it was working to repel a Ukrainian drone attack on Toropets, where there's a major military depot, as explosions lit up the night.

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A huge explosion has rocked the Tver region, in the west of Russia, after Ukrainian long-range attack drones targeted a sprawling ammunition depot there. Such was the power of the detonation that a light-magnitude earthquake was reported in the Tver region,

A drone attack has destroyed a Russian weapons arsenal storing missiles, bombs and ammunition, according to a Ukrainian security source. NASA satellites detected heat from a site in the Tver region and monitoring stations recorded what sensors thought was a minor earthquake.