Sir Keir Starmer and other international leaders have called the US-drafted peace plan for Ukraine “a basis which will require additional work”, as they expressed concerns about the proposal to limit Kyiv’s armed forces.

In a joint statement issued on Saturday following their meeting at the Johannesburg G20 summit, shunned by Donald Trump, the leaders also stressed that “borders must not be changed by force”.

Washington reportedly pressed Kyiv to accept the agreement it secretly drafted with Russia, which would see the invaded country make major concessions including surrendering territory, cutting the size of its army and giving up its path to Nato membership.

In their response, the Prime Minister and 12 other European and international leaders said: “We welcome the continued US effort

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