The US Dollar / Ruble is the most popular pair to trade the Russian currency. There is no official symbol for the Ruble. Russia is the R of the four BRIC emerging markets and the eighth largest economy of the world. Russia is the world's leading oil producer since 2011, and the Ruble is therefore exposed to changes in global energy prices. The Russian economy is both a high growth one and exposed to changes in the global financial markets, which is why it was hard hit by the crisis in 2008 and 2009.
All currencies are not the same; emerging market FX trades differently than developed market FX.