Ukrainian President Volodymyr Zelenskyy said Monday that the suggested legal recognition of Russian sovereignty over captured territory in the east of his country remained a "main problem" in negotiations as President Trump pushes for a deal to end Moscow's nearly-four-year war on Ukraine .

Ukrainian and American officials met over the weekend in Switzerland to discuss a 28-point proposal floated last week by the White House. They discussed the possibility of Zelenskyy visiting the U.S. this week as part of Mr. Trump's bid to get an agreement by Thanksgiving, CBS News' Margaret Brennan reported, citing multiple U.S. and Ukrainian officials familiar with the discussions.

Mr. Trump has described the Thanksgiving deadline as flexible, and he told reporters Saturday that the plan

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