The Russians attacked Ukraine with 104 Shahed attack UAVs and decoy drones on the night of 26-27 January; 57 of them were destroyed by Ukrainian air defence forces, 39 others disappeared from radar, and the attack caused damage in four oblasts.

Videos showed fireballs over a facility in Ryazan, 110 miles southeast of Moscow. Kyiv is seeking to disrupt Russian military logistics and put pressure on the country’s economy by striking its oil industry.

Ukraine's forces have carried out repeated aerial bombardments of strategic industrial sites in Russia, causing havoc and substantial damage.

Kyiv says it struck a Russian oil refinery and a microchip factory in attack which Moscow says contained 120 drones

Russia and Ukraine exchanged large drone attacks on Sunday night into Monday, with alleged Ukrainian UAVs forcing flight restrictions at three Russian airports.

Russia’s military on Tuesday said it would retaliate against Ukraine after Kyiv attacked Russian regions by firing six US-made ATACMS ballistic missiles, six UK-made Storm Shadow cruise missiles and launching one of the biggest drone attacks to date.

Ukraine is using unmanned aircraft carrying explosive warheads as part of a campaign of long-range drone attacks, aiming to inflict blows on Russia far behind the front line. Kyiv's military granted Reuters exclusive access during the launch of the drones.