What Ukraine's incursion into Russia means for the war – video explainer

Ukraine launched the surprise incursion into the Kursk and Belgorod regions of Russia with armour and infantry on 6 August, involving thousands of troops amounting to 14 brigades. While initial details of the attack were murky, Kyiv and Moscow have now acknowledged the operation into the Russian border regions, while independent analysts have verified claims about the scale of the advance by geolocating images posted by Ukrainian troops.