Russia pumps gas to lots of sources. Germany and Eastern Europe account for most of their market in Europe.
Russia's thing though is they love to pretend that this "leverage" as they think of it, is the only thing that matters in the world. Nevermind the fact that oil and gas has failed to make Russia a wealth country (the EU economy is 9 times the size of Russia's), that prices have fallen through the floor, and that there aren't alternatives.
What they do is what Shalcker up there does, which amounts to a very elaborate way of saying "I hope it's a seller's market in the future". In reality though, Russia has done nothing to use the 2000s commodity boom to diversify away from natural resources, and as a result is economically going to pay a huge price for years to come. This is one reason STRATFOR predicts Russia will collapse.
The US and EU have been working to diversify EU energy sources away from Russia for years. One way has been for the EU to take up contracts with Middle Eastern and African countries as US Energy independence emerged over the last decade, freeing up capacity for their consumption.