Ukraine’s military on Sunday said it had destroyed one of Russia’s newest and most advanced fighter jets in a drone strike on a military base deep inside Russia.

The Sukhoi Su-57 fighter, nicknamed the “Felon” by NATO, was struck on the tarmac of an airbase in the Astrakhan region, almost 600 kilometers (372 miles) behind the front lines of fighting in Russia’s invasion of Ukraine, according to Ukraine’s defense intelligence agency (GUR).

The agency posted satellite pictures in a post on its Telegram channel to support its claim, writing, “The images show that on June 7, Su-57 was still intact, but on June 8, craters from the explosion and distinctive fire spots emerged near it as a result of the fire damage.”