Leaders of some of the world's most powerful countries pushed back on demands that Ukraine cede territory and limit the size of its army included in President Donald Trump's latest proposal to end the war with Russia. But they said they believed the plan provided a basis for further negotiations, according to a joint statement released after they met in Johannesburg on Saturday.The proposal, a 28-point plan, calls for Ukrainian concessions already largely rejected by the country's president and allies. Trump gave President Volodymyr Zelenskyy of Ukraine until Thursday to agree to the plan, though he said Saturday the plan was "not my final offer" and suggested that the deadline could be extended should progress be made in negotiations.It remained unclear Saturday how much wiggle room Ukrai

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