“Today I informed the President of Arizona State University Michael Crowe and Cindy McCain that, it seems to me, the recent media attention to my work as the US Special Representative for Ukraine may become a factor distracting from the achievements and ongoing development of the institute, therefore I am leaving the post of Executive Director of the John McCain Institute, ”TASS quoted Volcker as saying.

On September 28, CNN, citing three sources familiar with the situation, announced that U.S. Special Representative for Ukraine Kurt Walker had resigned.

It was also reported that Walker and former U.S. ambassador to Kiev Mary Jovanovic will testify in Congress on a telephone conversation between US and Ukrainian leaders Donald Trump and Vladimir Zelensky.