Sir Keir Starmer has said there is "more to do" on Donald Trump's peace plan for Ukraine, after meetings with other world leaders at the G20 in Johannesburg. The Prime Minister and other allies have raised concerns about proposals to make Kyiv limit its armed forces, give up territory, and abandon its path to NATO membership. Mr Trump has said he expects a Ukrainian response to the proposals - which were drawn up after secret negotiations with Moscow - by Thursday. US, Ukrainian and European security officials are to meet to discuss the plans in Switzerland tomorrow.