Kushner
Ivanka has indirect tied to Deripaska by way of a friend who is an ex wife of a Deripaska business head.
Ivanka and Kushner originally broke up. Then, she had a sudden change of heart and called it "the best business decision ever made." Horrible way to describe marriage, frankly.
Kushner is a Soros flunkie. Went way into debt to purchase media organizations and then real estate as a developer.
I would make the argument that Ivanka married Kushner after being told she would face sanctions against her business because "she has ties to Deripaska" - however loose they are.
Kushner is also likely the one who set up the interview with the Russian lawyer for Don Jr. And is quite probably the one who put into place Carter Page and Paul Manafort in preparation for the Fisa abuses.
And possibly poppapotamus. I don't trust Papa-D. Dude came out of nowhere and was a lynchpin in making things go the way they did for the Steele dossier.
President Trump is the definition of a Wild Weasel SEAD strategy at this point. Nearly everyone around him is his enemy.