Small bands of Russian soldiers thrust deeper into eastern Ukraine on Tuesday ahead of a summit this week between Russian President Vladimir Putin and U.S. President Donald Trump, which European Union states fear could end in peace terms imposed on an unlawfully shrunken Ukraine.

The upcoming summit between President Donald Trump and his counterpart Vladimir Putin is being used by the Kremlin to divide the U.S. from Europe over the war in Ukraine, according to analysis.

Ukrainian President Volodymyr Zelensky quickly denounced the idea of giving up territory to Russia in a video address on Saturday, vowing that Ukraine would not “gift their land to the occupier” and warning that any peace talks that didn’t involve Kyiv would “bring nothing.”