Ukraine's president says a new prisoner exchange with Russia is ongoing and will take days, as both sides continue launching hundreds of attack drones.

Former Ukrainian Internal Affairs adviser Anton Gerashchenko, on X: "It is reported that for the first time in history, an F-16 has shot down a Russian Su-35 'Flanker...Thankful to Ukrainian Allies for providing us with the tools!"

A prisoner exchange is under way between Russia and Ukraine, governments in Moscow and Kyiv have confirmed. Ukraine's President Volodymyr Zelensky said the exchange would unfold "in several stages" over the coming days,