Ukrainian forces are under intense pressure in Russia's Kursk region, where they grabbed a chunk of land last August and have held on to it through more than seven months of fierce fighting.

Russia says it will discuss the U.S. ceasefire proposal, but Vladimir Putin has signaled he seeks to expel the remnants of Ukrainian forces from Kursk.

Kyiv has called on Moscow to respond to the proposed ceasefire - the Kremlin says it is waiting to be briefed by the US.