Vitkoff negotiated with Putin without his translator, violating protocol, — NBC News
According to the publication, citing sources, Trump's special representative on March 13 and April 11, Vikroff "used" a Russian translator.
If they speak to each other in Russian, he does not understand what they are saying.
Two former American ambassadors reported that Vitkoff does not speak Russian. Thus, by using Kremlin translators, he risked missing some nuances in Putin's messages and would not be able to independently verify what he was told.