Ukraine strikes Moscow's most advanced fighter jet inside Russia

Driving the news: Ukraine's defense intelligence agency (GUR) announced Sunday that it had targeted a Sukhoi Su-57 fighter jet the day before and that satellite images confirmed the strike.

• The attack took place at the Akhtubinsk airfield in Russia's Astrakhan region, about 366 miles behind the front lines, GUR added.
• "The Su-57 is Moscow's most advanced fighter" jet that can carry two different types of cruise missiles. The Russian military has a limited number of them, the GUR added.
• The GUR did not specify exactly how the strike was carried out.

State of play: The Su-57 is a stealth fighter jet that was seen as Russia's answer to Western stealth jets, such as the U.S. Air Force's F-22 Raptor.

• It's unclear exactly how many of the jets Russia has, per CNN.
• In the wake of the attack, Russian military bloggers have criticized the lack of hangars to protect the stealth jets, according to the Institute for the Study of War.

Go deeper: Ukraine has "freaking decimated" Russia's military, Biden says