A Ukrainian drone reportedly destroyed “tens of millions” of pounds’ worth of Russian armoured vehicles, tanks and anti-aircraft guns after seamlessly slipping into a warehouse close to the front line.

Footage of the strike appeared to show drones armed with explosives entering the building in Ukraine’s eastern Donetsk region unchallenged through a large uncovered opening.

The first unmanned aerial vehicle can be seen hovering inside the building watching over the Russian equipment stored inside.

It eventually smashes into a BMPT “Terminator”, a rare Russian armoured fighting vehicle.

Shortly afterwards, a succession of Ukrainian drones, many with low battery, swoop down into the warehouse, crashing into the parked equipment.

As more drones approach the building, fires can be seen raging inside.

Wild Hornets, a pro-Ukrainian channel on the Telegram messaging app, said the Ukrainian Bulava strike unit also destroyed two T-72 tanks, two S-60 anti-aircraft guns, a BMP-3 infantry fighting vehicle and two off-road trucks loaded with ammunition.

“As a result, the entire hangar completely burned down,” it wrote.

Aerial footage captured of the strike from further away appeared to show huge plumes of black smoke rising from the warehouse building after the initial strikes.

The attack was said to have taken place in the Donetsk region village of Staromlynivka, around three miles from the front line on the Velyka Novosilka axis of advance of Ukraine’s summer counter-offensive.

Rob Lee, a senior fellow at the Foreign Policy Research Institute think tank, wrote: “Notably, cheap nets over the entrances likely could have prevented these losses.

“An indication of complacency leaving this much equipment this exposed so close to the front line.”

The Telegraph could not independently verify the claims.

Drones, especially first-person view (FPV) ones piloted with virtual reality headsets, have become vital for Ukraine in narrowing the quantitative advantage Russia has with long-range weapons on the front line.

Most of the kamikaze drones are built domestically inside Ukraine, which is seen as increasingly important given the lack of support with more conventional military equipment from the war-torn nation’s western allies.

Britain, alongside Latvia, also recently pledged to donate thousands of FPV drones to aid Kyiv’s armed struggle against Moscow’s occupation.

Volodymyr Zelensky warned that Russia was “taking advantage of the delays in aid” in a video address late on Thursday.

“There is a deficit of artillery. There is a need for front-line air defence and for a longer range of our weapons,” Ukraine’s president added.

But Western intelligence officials and analysts have played down the possibility of Russian gains following the recent capture of the Donetsk region city of Avdiivka.

Britain’s Ministry of Defence said Moscow’s forces would require a “period of rest” after seizing control of the industrial hub.

“It is likely that Russian forces lack the combat effectiveness to immediately exploit the capture of Avdiivka and will require a period of rest and refit,” it wrote in its daily battlefield update on Tuesday.