Dhaka, April 24 -- US President Donald Trump and Ukrainian President Volodymyr Zelenskiy clashed again on Wednesday on efforts to end the three-year-old war in Ukraine, with the US leader chiding Zelenskiy for refusing to recognize Russia's occupation of Crimea.

Trump's Vice President JD Vance said it was time for Russia and Ukraine to either agree to a US peace proposal "or for the United States to walk away from this process," echoing a warning from Trump last week, reports Reuters.

Speaking to reporters in India, Vance said the proposal called for freezing territorial lines "at some level close to where they are today" and a "long-term diplomatic settlement that hopefully will lead to long-term peace."

"The only way to really stop t...