Yakiv Smolii / REUTERS

Read alsoUkraine's National Bank cuts key policy rate to 6%

"An independent National Bank is a foundational achievement for Ukraine that has reduced corruption, driven growth & rescued a failed banking sector. To undermine this crucial institution would be a big step back and jeopardize the credibility of and support for Ukraine's reforms," they said in a statement posted on the Twitter account of the U.S. Presidency of the G7 Ambassadors' Support Group on July 1.

As UNIAN reported earlier, Smolii signed a letter of resignation on Wednesday, July 1, 2020.

The move is a result of what he claims is long-standing political pressure.