Ukraine unleashed more than a hundred drones smuggled deep into Russia in what it called its most damaging attack yet.

Across the country, swarms of small explosive drones descended onto military bases and destroyed a large part of Russia's nuclear bomber fleet. The flying bombs were smuggled into Russia by Ukrainian intelligence services in a plot known as Operation Spiderweb.

Ukraine says it has completed its biggest long-range attack of the war with Russia on Sunday, after using smuggled drones to launch a series of major strikes on at least 40 Russian warplanes at four military bases.