European and other Western leaders meeting on the sidelines of a G20 summit scrambled on Saturday to come up with a coordinated response to U.S. President Donald Trump's demand for Ukraine to accept his peace plan with Russia by Thursday.

Amid a U.S.-proposed plan to end Russia's nearly four-year war in Ukraine, the Office of the President of Ukraine said Saturday that "consultations on steps to end the war will take place in the coming days.

Ukrainian contacts react negatively to Trump's 28-point peace plan for Ukraine, calling it heavily slanted toward Moscow as Zelenskyy reviews terms.

American senators panned a U.S. peace proposal on Ukraine at a international security conference in Canada, with one calling it one of the most serious geopolitical mistakes of his lifetime