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.

U.S. President Donald Trump urged Kremlin leader Vladimir Putin on Friday to spare Ukrainian troops that Russia is pushing out of its Kursk region, an appeal Putin said he would honor if they surrendered.

President Vladimir Putin called on Friday for beleaguered Ukrainian troops in the Russian region of Kursk to "surrender" as Ukraine's President Volodymyr Zelensky accused the Russian leader of seeking to sabotage a ceasefire initiative.