THIS is the moment a gunpowder factory was allegedly blown up by a Ukrainian kamikaze drone, turning the sky crimson red.

It comes just after Ukraine reportedly destroyed two Russian assault boats with crew on board in annexed Crimea.

The dramatic footage shows a blazing fire on the horizon in Kotovsk which Russian media reports claim was from the factory.

A loud explosion was reportedly heard moments before the sky was set ablaze around midnight on Friday.

The huge fire can be seen lighting up the sky from miles away in the Tambov region, south of Moscow.

Ukrainian telegram channels claimed it was caused by one of their kamikaze drones.

No casualties have been reported as of yet.

Hours earlier on Friday two Russian assault boats with crew on board were allegedly blown up by the same drones.

The ships were reportedly carrying loaded armoured vehicles, including personnel carrier BTR-82.

The Russians are also alleged to have had Tor-M2 air defence systems on board the boats, for cover of their group on the island and in the Black Sea.

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Ukrainian media outlet TSN news wrote on Telegram on Friday morning: “As a result of a night operation on the territory of the temporarily occupied Crimea, small landing ships of the Black Sea Fleet of the Russian Federation were damaged by soldiers.

“We are talking about boats of project 11770 (of the “Serna” class).”

It alleged the small boats, used by Russia during the occupation of Zmiinyi Island to transfer military equipment, were carrying a crew and loaded vehicles.

Dramatic black and white footage showed the moment alleged Ukrainian kamikaze drones hit the Russian navy crafts near Crimea.

A ship can be seen in the aim sight of a sea drone camera before a huge explosion engulfs the screen.

Ukraine’s “invisible” underwater kamikaze drones, capable of carrying 1,000lbs of explosives, are Vladimir Putin’s newest nightmare.

The newly-designed $355k and 20ft Marichka torpedo-like weapons were only recently taken for a test swim, as Ukraine ramped up production of unmanned marine assault weapons.

It is the latest creation of Ammo.Ukraine, a volunteer organisation that is helping to turn the tides in the so-called “War of the Drones”.

In August, a marine drone packed with 450kg of TNT explosives attacked another Russian warship at Novorossiysk naval base.

Video showed the alleged SBU Ukrainian intelligence sea drone zooming towards the boat in the cover of darkness.

The footage abruptly ended as it appeared to hit the warship, believed to be either the Olenegorsky Miner or Olenegorsky Gornyak.