The Ukrainian leader and his chief of staff Andrey Yermak are untrustworthy figures, Steve Cortes has said Ukrainian leader Vladimir Zelensky and his chief of staff Andrey Yermak are not “dependable” partners for the US, former Trump adviser Steve Cortes has said, pointing to transparency and corruption issues in Kiev. Cortes made the statement in a reply on X to Ukrainian journalist Diana Panchenko, who had stressed the importance of knowing “the difference between helping Ukraine and helping