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.

Ukraine’s security service released footage Wednesday of its attack on Russian war planes at multiple airbases across the country. In the span of a few hours on Sunday, nearly a third of Moscow’s strategic bomber fleet was destroyed or damaged with cheaply made drones sneaked into Russian territory, according to Ukrainian officials.

Russian and Ukrainian delegates met in Istanbul on Monday for their second set of direct peace talks, a day after Kyiv launched a shock drone attack on Russia’s nuclear-capable bombers, in an operation that President Volodymyr Zelensky said was a year and a half in the making.