U.S. President Donald Trump says he spoke with Russian President Vladimir Putin on Wednesday and that the Russian leader told him “very strongly” that he will respond to Ukraine’s weekend drone attack on Russian airfields.

Ukraine’s drone attack against Russian airfields was audacious and daring. But most of all, it was meticulously planned and flawlessly executed.

New satellite images and drone footage show serious damage inflicted on aircraft at several Russian airbases during Ukraine's surprise drone strike on Sunday. The images of two Russian airbases in north-western and central Russia, taken on Wednesday morning, show 12 aircraft damaged or destroyed.