They don't have the range to attack the main oil production areas in West Siberia. If they did manage to reach a target 2,000+km away, then I'd imagine things would escalate even further very quickly.
Russia Oil Map (carnegieendowment.org)
Edit:
The same goes for the main gas producing regions. (Note the lack of any real pipeline network to China, something that is seriously hindering Russia's ability to sell gas on a major scale).
Main present and perspective Russian production regions | Download Scientific Diagram (researchgate.net)