Timber is sustainable, as it can be replanted and is in abundance, especially in Russia. Oil and natural gas aren’t as sustainable, because they are an non renewable resource like timber is.
Russia contains 30% of all the natural resources in the entire world. It contains the world's largest natural gas reserves, the second largest coal reserves, and the eighth largest oil reserves.
In the 1990’s, they needed to borrow a lot of money from the IMF after their economic crash from turning from communism. Nowadays, they receive $10 billion roubles, which is about $200 million Canadian dollars.