The monetary unit of Russia is the ruble. Small coins: 10, 50 copecks (small, yellow color). There are even smaller: 1 penny and 5 cents, they almost do not occur, tk. nothing is worth. Coins larger than rubles: 1, 2, 5 (white), 10 rubles (yellow). Banknotes - 50, 100, 200, 500, 1000, 2000, 5000 rubles.
In Russia, Visa and Mastercard payment systems are mainly distributed. Payment system UnionPay is not common! ATMs in Russia are distributed in many places: shopping centers, banks, on the street! But if you go to some remote village, it's better to take cash! ATMs working with the payment system Union pay is not very much. If you took only a payment card UnionPay and found an ATM, which it gives you cash, then change immediately more cash - this opportunity may no longer be presented. Cash to take with you is better than US or EURO - you can exchange them everywhere at a favorable rate. You can change the currency to rubles in the exchange offices in banks. You will be asked to show your passport if you change the amount over 15 000 rubles, Never change money from questionable personalities near train stations and underground passages! They can easily deceive you and give you false money!