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

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.

Ukraine secretly conveyed containers deep beind Russia's front lines. The drones inside were able to destroy Russian bombers that may never be replaced. Videos and satellite images verify some claims of unprecedented damage.