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 Volodymyr Zelensky said that Ukrainian troops have not been encircled by Russian forces in Kursk region, accusing Russian leader Vladimir Putin of “lying” about the situation on the ground.

President Trump and President Vladimir V. Putin both claimed that Ukrainian forces were surrounded. Ukraine’s top military commander vowed to “hold the line.”