A surprise Ukrainian drone attack that targeted Russian air bases hosting nuclear-capable strategic bombers was unprecedented in its scope and sophistication, and dealt a heavy blow to the Russian military.

The strikes help Kyiv "negotiate from a position of strength," Oleksandr Merezhko, the head of Ukraine's parliamentary foreign affairs committee, told Newsweek.

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

Though the knock-on effects are unclear, some military commentators have called the strike Russia's "Pearl Harbor." Hopes for direct peace talks, which resume Monday, remain low.

The covert operation was described as one for the “history books” by Ukraine’s president. According to Ukrainian officials, nearly a third of Moscow’s strategic bomber fleet was destroyed or damaged with cheaply made drones sneaked into Russian territory in the span of a few hours on Sunday.

A battle is shaping up in the skies over Ukraine and Russia, as the ingenuity of drone engineers on both sides opens up new opportunities and threats far behind the front lines.

Ukrainian security sources told CBS News that Sunday's drone strikes inside Russia, called "Operation Spider's Web," took over a year to plan and execute. The drone attacks, which reportedly destroyed 40 Russian bombers,

After too many nights of pulling children from the rubble of Russian drone strikes, the weekend’s devastating attacks on Moscow’s military pride mark a brief respite for Ukrainian morale, and yet another twist of the unexpected.

Ukraine launched a drone assault deep into Russia that targeted Russia’s long-range bombers, including A-50s, Tu-95s, and Tu-22Ms. The Ukrainian Security Service claimed that the operation —

This appears to be the first confirmation that one of the Sky Sentinels had downed up to six exploding drones. Ukraine previously said that the turret had been successfully tested, including on the front lines.