It came as Russia and Ukraine swapped 150 prisoners of war each and UK foreign secretary David Lammy met with Ukrainian president Volodymyr Zelensky in Kyiv.

There are increasing reports from the front about massive Ukrainian drone attacks on targets in Russia. In response, Moscow has deployed a record number of drones in recent months. "We have a positional war on both sides,

Drones and missile attacks have repeatedly targeted oil refineries, as well as sites belonging to the military-industrial complex.