They hold the majority on the SCOTUS. The entire federal judiciary is not in their pocket for the love of god - Spanky has been blocked by a federal judge from somewhere at every turn.
It’s enough that they have Congress and the presidency and that guarantees a bad economy.
Bush did -plenty of damage. It mostly got cleaned up domestically.
The sanctions will effectively prevent them from being questioned about their activities
It’s doubtful he or any of the other oligarchs are gonna be in a place where they can be served, particularly now that Mueller has begun subpoenaing their electronics and detaining them at the airport.