BERLIN: A Ukrainian drone attack last weekend likely damaged around 10 percent of Russia’s strategic bomber fleet and hit some of the aircraft as they were being prepared for strikes on Ukraine, a senior German military official said.

“According to our assessment, more than a dozen aircraft were damaged, TU-95 and TU-22 strategic bombers as well as A-50 surveillance planes,” German Major General Christian Freuding said in a YouTube podcast reviewed by Reuters ahead of its publication later on Saturday.

The affected A-50s, which function similarly to NATO’s AWACS planes by providing aerial situational awareness, were likely non-operational when they were hit, said the general who coordinates Berlin’s military aid to Kyiv and is in close touch with the Ukrainian defense ministry.

“We believe that they can no longer be used for spare parts. This is a loss, as only a handful of these aircraft exist,” he said. “As for the long-range bomber fleet, 10 percent of it has been damaged in the attack according to our assessment.”

The United States estimates that Ukraine’s audacious drone attack hit as many as 20 Russian warplanes, destroying around 10 of them, two US officials told Reuters, and experts say Moscow will take years to replace the affected planes.