Rudy Giuliani's top Ukraine allies have been accused of working for Russian President Vladimir Putin.
Ukrainian lawmaker Oleksandr Dubinsky joined a criminal organization financed by Russia's military intelligence, Ukraine's Security Service (SBU) said in a statement on Monday.
He was not named as the politician suspected of treason in the SBU statement, but Reuters reported that he was identified by two Ukrainian lawmakers on the messaging platform Telegram.
The SBU said the criminal group received more than $10 million to "take advantage of the tense political situation in Ukraine and discredit our state in the international arena."
Newsweek has contacted an attorney for Giuliani for comment via email. Dubinsky could not immediately be reached for further comment.