Russia-Ukraine war: Fighting in Kursk enters third day, Russia says

Mykhailo Podolyak, a long-term aide to President Zelensky added: “War is war, with its own rules, where the aggressor inevitably reaps corresponding outcomes.”

Russia’s defence ministry said advancements and “breakthrough attempts” by the Ukrainian army’s formations in the Sudzhansky and Korenevsky districts in Kursk were thwarted in a combined effort from the Federal Security Service (FSB) and the military.

The Kremlin said Ukraine had lost 660 military personnel since the start of hostilities in Kursk. Mr Belostotsky claimed Kyiv’s forces were beginning to retreat from the region.

The BBC is unable to verify death tolls in active conflicts, and fatalities reported by adversaries are often not a true representation of the situation on the ground.

In its update on Thursday Moscow said Kyiv had lost 82 units of armoured vehicles. A much higher number than its initial report that 11 tanks and more than 20 armoured vehicles had entered Russia near the town of Sudzha on Tuesday morning.

Also on Thursday Russia suggested, for the third consecutive day, to have stopped Ukrainian troops from advancing in Kursk.

But on Wednesday, Russia’s Chief of General Staff Valery Gerasimov said the “advance” into the Kursk region had been stopped, with Russian forces “continuing to destroy the adversary in areas directly adjacent to the Russian-Ukrainian border”.

While the FSB made claims to a similar effect on Tuesday, when initial reports of a potential Ukrainian incursion surfaced.

In its latest report, the Institute for the Study of War, a well-respected think tank, said geolocated footage from the past two days showed that Ukrainian armoured vehicles have advanced to positions 10km (6.2 miles) into the Kursk region.

Meanwhile, footage verified by the BBC has shown fighter jets flying low overhead in the region in recent days.