Oleksandr Bevz also said the U.S. showed “great openness and understanding” that security guarantees are the cornerstone of any agreement for Ukraine. He said the U.S. would continue working on the plan, then the leaders of Ukraine and the U.S. will meet. After that, the plan would be presented to Russia.

Donald Trump hit out at European and Ukrainian leaders yesterday as they held talks about a US plan to end the war with Russia, amid confusion about Washington’s position.

“We are clear on the principle that borders must not be changed by force. We are also concerned by the proposed limitations on Ukraine’s armed forces, which would leave Ukraine vulnerable to future at...