Edit: @potench preev.com is an inaccurate indicator of the BTC/RUB rate because it is basing its calculation "based on the USD Bitcoin price" per its footnote, so of course it will never show a big deviation from the BTC/USD rate. For the true rate you need to look at the real-time bid/ask spread on a BTC/RUB exchange such as btc-e.com which is why I linked to https://bitcoinwisdom.com/markets/btce/btcrur or you can also look at https://btc-e.com/exchange/btc_rur: bid/ask is 20855/21099 RUB as of 22:09 UTC, so the arbitrage opportunity is approximately 2000 RUB.
http://qz.com/312598/bitcoin-is-the-worst-investment-of-2014...
But if you bought BTC only 60 days earlier (November 1st, 2013), it was at $200, so you would have a +65% return rate as of today, easily beating the ruble, or virtually any of the world's currencies for that matter: http://bitcoincharts.com/charts/bitstampUSD#rg60zigDailyzczs...