Ukrainian President Volodymyr Zelensky said Saturday his forces were "strengthening" their positions in Russia's Kursk region, where Kyiv has been mounting a major ground offensive for more than 11 days. His comments came a day after Moscow accused Ukraine of destroying a key bridge over a river in the border region, as Kyiv seeks to disrupt supply routes and the movement of Moscow's troops in the area. Ukrainian army chief Oleksandr Syrsky "reported on the strengthening of the positions of our forces in the Kursk region and the expansion of stabilised territory", Zelensky said in a post on Telegram.

"As of this morning, we have replenished the exchange fund for our country," Zelensky said, referring to Russian soldiers Ukraine has captured to be used in future prisoner swaps. "I thank all the soldiers and commanders who are taking Russian soldiers prisoner and thus bringing the release of our soldiers and civilians held by Russia closer," Zelensky said. Kyiv claims to have taken control of more than 80 settlements in the lightning incursion, which caught the Kremlin off guard almost two and a half years into its full-scale invasion of Ukraine.

The Russian defence ministry said on Saturday it had pushed back Ukrainian forces near three settlements in the Kursk region, and was searching for "mobile enemy groups" trying to pierce deeper into the country. Russian officials on Friday accused Ukraine of striking a strategically important bridge just a couple dozen kilometres away .