Ukraine’s shock drone strike on Russia’s strategic bomber fleet this week has generals and analysts taking a new look at threats to high-value United States aircraft at bases in the homeland and abroad – and the situation is worrisome.

Russia launched an intense missile and drone barrage at the Ukrainian capital Kyiv in the early hours of Friday, killing at least six people, Ukrainian officials said, as powerful explosions reverberated across the country.

The barrage, one of the fiercest of the three-year war, struck six Ukrainian territories, killing at least six people and injuring about 80, Ukrainian officials said.

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Ukraine said its “Operation Spiderweb” attacked Russian warplanes worth hundreds of millions of dollars, utilizing drones that each cost under $1,000 and were launched from wooden containers carried on trucks.

Ukraine’s drone strikes deep into Russia delivered a humiliating blow to Moscow last weekend. Kyiv’s defenders celebrated the attack as a triumph of modern warfare and a warning to Russian President Vladimir Putin. But the extraordinary operation got a different response inside the White House: anger.

On June 1, Ukraine targeted several Russian air bases using first-person view (FPV) drones, cheap aerial vehicles which are remotely operated by pilots using camera feeds. According to reports, Ukraine used machine-learning algorithms to guide the drones to the target area.

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

Europe is capable of sustaining Ukraine's resistance against Russia, even if the United States were to decide to completely halt its military support to Kyiv, the senior military official in charge of coordinating Germany's arms supplies told Reuters.