• I'm not exactly sure if this is correct ... but you can give it a try . (I'm not 1OO% certain, somebody may update the answer ...).
○ I think that most such resources are located in remote and climatically unfavorable areas that are difficult to develop.
• Yes, this may not be exactly helpful, but its better than nothing! ;]
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Many of the problems with Russia are similar to the problems of (for example) Canada or inland Alaska -- half of the country suffers from very harsh winters, and there still isn't that much train or high-quality road access. Russia has developed enormously in the past two decades, but it still suffers from a lack of infrastructure once you get away from the European quarter, or from the southern cities of Siberia.
Short growing season, Insufficient rainfall, and lack of fertile soil make farming difficult.
Russia actually has several untapped oil reserves, but they are so far from any existing infrastructure, that they are very expensive to develop.