Russian forces have been steadily retaking territory in the Kursk region, the area of Russia that Ukraine attacked in 2024. It comes as the US tries to get Russia to agree to a ceasefire in the three-year long conflict.
BBC Verify’s Nick Eardley has been looking at the situation.
Verification: Benedict Garman, Kayleen Devlin, Thomas Spencer, Yaroslava Kiryukhina and Fridon Kiria
Motion graphics: Jacqueline Galvin