Ukraine's President Volodymyr Zelensky has urged US President Joe Biden to attend a peace summit due to be held in Switzerland in mid June.
Mr. Zelensky said his key ally's possible absence would only be applauded by Russian President Vladimir Putin.
Reports suggest President Biden and Vice President Kamala Harris are set to miss the summit.
Although some form of US representation is expected, the president's absence would be a huge blow for Ukraine.
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