Regarding the Kuznetsov, when you are an oil exporter oil fired boilers do restrict range, but are much cheaper than nuclear power. A Nimitz carrier might be able to sail at 30 knots for 10 years non stop, but it will run out of jet fuel quickly enough if it outruns its logistics tail. If they must have a logistics tail then adding fuel to the carrier is just one extra logistics burden... not really a huge deal for the Russians. The US on the other hand have logistics and support bases all over the world so it makes more sense for them to be sailing towards their jet fuel at high speed... for the Russians they will be sailing away from their carriers fuel... if you know what I mean.
Jet fuel? Its power plant uses mazut (black oil). But its damn "gluttonous". It was designed this way not because of oil exporter policy, just because we didn't have a stable naval nuclear power plant at that time.