Ukraine says it struck a stealth warplane deep inside Russia

Ukraine said its forces hit an ultra-modern Russian warplane stationed on an air base nearly 600km from the front lines.

Kyiv's main military intelligence service shared satellite photos it said showed the aftermath of the attack.

If confirmed, it would mark Ukraine's first known successful strike on a twin-engine Su-57 stealth jet, lauded as Moscow's most advanced fighter plane.

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In one photo, black soot marks and small craters can be seen dotting a concrete strip around the parked aircraft.

According to the Main Intelligence Directorate of Ukraine's Ministry of Defence, the strike took place last Saturday at the Akhtubinsk base in southern Russia, some 589km from the front line.

The Ukrainian agency said the plane, which is capable of carrying stealth missiles across hundreds of kilometres, was among "a countable few" of its type in Moscow's arsenal.

According to reports by Russian agencies, Moscow's air force obtained "more than 10" new Su-57s last year, and has placed an order for a total of 76 to be delivered by 2028.

A spokesman for Ukraine's military intelligence, Andriy Yusov, hours later said on Ukrainian television that the attack may have damaged two Su-57 jets parked at the base, and also wounded Russian personnel.

He did not immediately give any evidence to support the claim.

Ilya Yevlash, a spokesman for Ukraine's air force, told Ukrainian media in April that Moscow was trying to keep its Su-57 fleet "at a safe distance" from Ukrainian firepower.

The strike comes after the United States and Germany recently authorised Ukraine to hit some targets on Russian soil with the long-range weapons they are supplying to Kyiv.

Ukraine has already used American weapons to strike inside Russia under newly approved guidance from President Joe Biden that allows American arms to be used for the limited purpose of defending Kharkiv, Ukraine's second-largest city.

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But the airstrip's distance from Ukraine, as well as unofficial comments from Russia, point to the likely use of Ukrainian-made drones.

Since Moscow's full-scale invasion more than two years ago, Kyiv has ramped up domestic drone production and used the munitions to strike deep inside Russia.

In January, drones hit a gas terminal near St Petersburg that lies more than 1000km north of the border.

Russia's Su-57 fleet has been largely absent from the skies over Ukraine, and has instead been used to fire long-range missiles across the border.

The UK Ministry of Defence said in an intelligence briefing last year that Russia is likely trying to avoid "reputational damage, reduced export prospects, and the compromise of sensitive technology" that would come from losing any Su-57 jets in enemy territory.