Russian air defence units downed 25 Moscow-bound Ukrainian drones throughout the day on Wednesday, Moscow Mayor Sergei Sobyanin said.

As it tried to demonstrate its continuing ability to fight, Ukraine said it had used drones to inflict serious damage on a Russian Kilo-class submarine at a Black Sea port.

Ukrainian special operators described to Business Insider how they came under Russian fire driving buggies near the front lines.

Russia has ordered a winter troop surge to break the stalemate in Ukraine, but Ukrainian drone attacks on logistics and resupply channels will undermine this offensive.

Ukrainian President Volodymyr Zelensky has revealed details of the latest US-led plan to end the war in Ukraine, saying it had been agreed between negotiators from Kyiv and Washington and sent to Moscow for feedback.

The drones are still in limited supply and are not always the ideal interception method, Ukrainian soldiers and an official told Business Insider.

"The SBU ‍continues to ⁠target facilities in the Russian oil and gas sector systematically. ​Each of these strikes hits the Russian budget, reduces foreign currency revenues, and complicates logistics and fuel supplies for the army,