Drones are “here and because they're ubiquitous, because they are quite useful and they're demonstrating that every day in Ukraine,” one analyst told NBC News.

Ukraine on Tuesday again attacked the symbolic Crimea Bridge across the Kerch Strait, which connects the illegally annexed peninsula to the Russian mainland. The attack came 48 hours after Kyiv’s unprecedented assault on air bases deep inside Russian territory,

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.