A former top U.S. diplomat posts about this via his social networks.
Michael McFaul, a former U.S. ambassador to Russian Federation, has been included in Kremlin sanctions list and thus banned from visiting Russia.
A former senior diplomat until 2014 and current Stanford professor reports about it in social networks.
He revealed his ban on visiting Russia while applying for visa to do Clinton transition work, McFaul revealed.
He is apparently under sanctions ban since 2014, when he quit his office in Moscow U.S. embassy, McFaul also adds.
McFaul also told that has been included in Kremlin's sanctions list because of my close affiliation with Obama, noting the U.S. sanctioned Russians are close to Putin.