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.

The targets were Russian warplanes, including strategic bombers and command-and-control aircraft, worth hundreds of millions of dollars. The weapons were Ukrainian drones, each costing under $1,000 and launched from wooden containers carried on trucks.