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How to invest in the Russian oil market?
The Russian ETFs may be broad, but a quick glance at ERUS and RBL's sector breakdown shows they're 45% and 47% energy sector, and their top holding is Gazprom comprising 9% and 14% of each ETF respectively, with plenty more oil and gas companies in their top 10 too.  A harder question would be how to invest in Russia and avoid oil I think (and even then, the economy is thoroughly bound up in it). To rework a meme... In Soviet Russia, oil invest YOU!