“While damage assessment is still occurring, it is confirmed as a direct hit,” a Ukrainian military source tells Sky News.

A Ukrainian warplane has for the first time fired a weapon that struck a target inside Russia, a Ukrainian military source has told Sky News.

The source said a “Russian command node” was hit on Sunday in the area of Belgorod, western Russia.

Belgorod is close to the border with northeastern Ukraine.

It was not immediately clear what type of munition was used in the attack, including whether or not it had been a Western weapon.