Russian President Vladimir Putin has called on Ukrainian troops in the Russian region of Kursk to surrender, as diplomatic back-and-forth continues over a potential US-brokered ceasefire with Ukraine.

Talks in Moscow with a U.S. special envoy indicated that Russia was keen to keep negotiating with the United States over Ukraine.

A Russian service member places a flag oh the roof of a house in a part of the Kursk region, which was recently retaken by Russia's armed forces in the course of Russia-Ukraine conflict, Russia, in this image released.