Ukraine aims to destabilise Russia with Kursk attack, official says

Troop numbers sent into Russia are in thousands, source says; cooling tower at Zaporizhzhia nuclear facility reportedly damaged by fire

Ukrainian sources have indicated that thousands of troops have been committed to its incursion into Russia's Kursk province, as Moscow and Kyiv traded accusations about a fire at the occupied Zaporizhzhia nuclear power plant 250 miles to the south.

A Ukrainian security official told the Agence France-Presse that the aim of the incursion was to destabilise Russia and string out Russian forces with light, fast-moving attacks. It remains unclear how sustainable the operation will be in the medium term amid Kremlin threats that it will be snuffed out using Russian reserves.