Ukrainian saboteurs have blown up a Russian fighter jet more than 1,000 miles behind enemy lines, it has been reported.

Citing a source in Ukraine’s military intelligence (HUR), the news agencies Ukrainska Pravda and RBC-Ukraine reported that a Su-34 was engulfed in flames at the Shagol airfield in Chelyabinsk, an industrial city to the east of the Ural Mountains.

“We can confirm that the enemy aircraft has been completely burnt out,” the source was quoted as saying.

Chelyabinsk is 1,008 miles to the east of the easternmost point of the current front line, a salient around the city of Siversk in Donetsk.

The Shagol airfield is home to a Russian air force regiment and a training unit.

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