Vladimir Putin is said to have faced renewed calls to "declare war" on Ukraine following Kyiv's audacious drone attacks on four air bases deep inside Russia. The US estimates more than 20 Russian bombers were damaged in the attacks by Ukraine's SBU security service after drones were smuggled into the country and launched from lorries.

Moscow’s drone strikes have grown exponentially thanks in part to a deal with Iran to produce its Shahed drones on Russian soil. An attack overnight that focused on Kyiv killed at least 15.