Russia's economy and energy security could not rely solely on oil and gas for the long-term strategy based on their economic dependence, geologic availability, and reserve policies. This thesis answers why and with what percentage will nuclear power take part in Russia's future energy portfolio, draws political indications from the interface of Oil & Gas--Economy--Nuclear--Policy. By doing Stakeholder and S.W.O.T. Analyses, nuclear power is the most reasonable choice to diversify Russia's energy portfolio. The predicted role of nuclear power by 2020 is indicated herein by its percentage out of the country's projected total electricity output, which is plotted from the Russian GDP and Electricity Output regression model. The percent range from 21.2% to 25.9% is calculated by a Russian nuclear electricity output equation. Concomitantly with a significant increase in nuclear power implies needs for aggressive fuel and technology policies and Rosatom's financial preparedness needs to be affirmative.