At least three people were injured in Ukrainian drone attacks on Russia's border region of Belgorod, the governor, Vyacheslav Gladkov, said on Telegram on Thursday. All were taken to hospital.

Ukrainian forces are increasing the intensity of long-range drone strikes deep into Russia ahead of Friday's planned meeting between Presidents Trump and Putin.

Ukrainian drones targeted four Russian airfields Wednesday in the largest such attack of the war, as Kyiv’s troops advance further into Russia following their surprise cross-border incursion that has left the Kremlin embarrassed and scrambling.