It depends on the poker site but most online poker sites in Europe will have options for local currencies. The Euro is of course widely available as is the British Pound on UK websites, which is a big advantage over playing at a US-centric poker site where you'll need to pay a fee to exchange your currency and makes deposits and withdrawals. If you want to play in your own currency in Russia, for example, you should look into a site like Lotos Poker which has a lot of local banking options