Ukraine has launched a counterattack in the southern Russian border region of Kursk, warning that Russia is “getting what it deserves.”

It comes as Ukraine's president says only the US can provide security guarantees leading to an end to the war.

Russian forces continue to make costly but consistent gains in the Donetsk region in eastern Ukraine. They are steadily grinding down a pocket of resistance around the town of Kurakhove and are also fighting to envelop the larger nearby city of Pokrovsk, Ukrainian soldiers and officials said.