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Dollars aren't used for any transactions you or I would make, people do still like making cash savings in Dollars or Euros if they can get their hands on them.

I was only there for a week, but no restaurants, hotels or museums wanted dollars. Most places accepted credit cards, and many assumed that was how I would be paying.

It's not the case anymore.

There was a major devaluation in 1998. This is the reason why people were still suspicious about rubles in the early 2000s.