There are "major flaws" in the US plan under discussion Sunday to end the war in Ukraine, Norwegian Prime Minister Jonas Gahr Store told AFP in South Africa.
A draft of the plan, which echoes several of Russia's hardline demands, has drawn pushback from Kyiv and its European allies who are seeking some changes.
"We need US engagement to help end the war in Ukraine and stop the Russian aggression. That is positive," Store said on the sidelines of the G20 summit.
"But the plan is insufficient and it has major flaws that need to be worked on. One of them is to get Europe at the table and, not least, get Ukraine at the table," he said.
"Changing borders by force is unacceptable," Store said, referring to the 28-point document.
Ukrainian, European and Canadian national security officials were gathering in Geneva on Sunday to discuss the proposal.
US Secretary of State Marco Rubio flew into the Swiss city for the discussions, after Washington signaled room for negotiation.
Store stressed that the plan must align with international law, including principles in the Charter of the United Nations.
He was among a host of international leaders in South Africa for the G20 meeting wrapping up Sunday.
European leaders attending a separate summit in the Angolan capital Luanda on Monday are also due to hold talks on the plan for Ukraine.
