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Ukrainian President Volodymyr Zelensky's freelance adviser Boris Tisenhausen has said the president of Ukraine and U.S. President Donald Trump may meet after the G20 summit, which will take place on June 28-29.

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In a comment to Radio Liberty's Ukrainian service, he said the fact that Trump's administration was the first to invite Zelensky to Washington for a meeting means "Zelensky has been given a certain credibility from the United States."

"It seems to me the administration of the White House hopes to drive from the dead-lock complex, including for them, issues," Tisenhausen said, reiterating one of the catalysts of the upcoming meeting of the presidents was a probe into the Ukrainian Burisma Holdings gas company.

As UNIAN reported earlier, U.S. President Donald Trump invited Ukrainian President Volodymyr Zelensky to pay an official visit to Washington, D.C.