Personally, I think the government has gotten 'Sanction fever'. They just cannot get enough of it as they see it as a no lose way of getting a message across.
But Russia is not Cuba or Iran.
They are the 2'nd largest exporter of oil and the largest exporter of natural gas in the world. Plus, America is not the all-powerful economy it used to be.
Also the petrodollar (and the greenback's reserve currency status) are INCREDIBLY important to the U.S. government/Fed. Lose those and the ability of the gov't./Fed to just 'print' their problems away gets MUCH more problematic.
The government should not, IMO, take this status for granted.
And next to Saudi Arabia and possibly China, no single country in the world has the ability to hurt the petrodollar more then Russia.
This is a game of chicken the Administration is playing that they probably won't lose...but they could get a lot more injured then they seem to be acting.