Ukrainian aircraft fired British-French cruise missiles at Russian troops attempting to advance towards a key city in eastern Ukraine, a Ukrainian security source has told Sky News.
The source shared drone footage that purportedly shows strikes on what he described as "two command centres of massive troops formations slowly advancing on Pokrovsk".
Details about whether any Russian military personnel were killed or wounded were not immediately clear.
The attack took place at 11am on Friday in the town of Avdiivka, which was captured by Russian forces in February.
The source said Russian commanders had been pouring troops, military equipment and supplies into the occupied areas of Donetsk as part of their offensive towards the key logistics hub of Pokrovsk.
"The Ukrainian Armed Forces used Storm Shadow/Scalp missiles, gifted by Western nations," the source said.