Putin has to pay for nothing. Sniffing Joe is always good for a couple more trillion of American tax dollars.
You are not correct.
At present, there are literally hundreds of millions of $$ of Russian assets held in sequestered accounts in the USA and Europe. These assets will be the first to be used to begin to pay for Ukranian reconstruction. The detailed plans for that action are certainly already made by the USA/Euro nations.
The Russian economy is pretty much already wrecked. The question of Allowing the economy to recover will be part and parcel of determining the revenue flow above and beyond the captured off shore accounts.
American taxpayer money will not be required nor provided