Ever since then, those people have been branded as traitors, if they are ever caught or set foot back in Russia, those people will immediately be imprisoned.
Likewise, I don't see how/why are we so dependent on these rich people. Whether we give them tax breaks or not, it does not escape the situation.
Hypothetically speaking, we can change the currency we have and completely null all their money. No government would want the old American dollars. Similar to how the Eurozone was created, money like the Franc are pretty much useless (as money at least.)
We can freeze the assets of those people before they are even allowed to move their funds to a private institution.
We can accept the fact that they don't care about the U.S. and tax them for them to leave. Then we can rebuild the states to ourselves and truly make a country that is by the people and for the people, or keep begging them like we seem to be now. After all, 4 years is already enough to see their viewpoint when it comes to the states.
If they are unwilling to pay their share, or hiding their tax money, we can just kick them out. They are not needed in a country where the people are slaving their way when it comes to working.