If you don't sell your resources then your country cannot buy anything from outside of Russia because you have nothing worthwhile to sell otherwise.

The question is not "What Russia could offer for sale to the world?", the question is "What world could really offer for Russia for sale?".

You cannot manufacture most of the things you need because your country is a 3rd world shithole that has no significant manufacturing capability and what there is, is dependent on foreign components, machines, tools etc.

Being "3rd world corrupt shithole" Russia, despite 30 years of NWO shills attempts still have decent aerospace, MIC, food production, agricultural machinery and all other stuff that is enough to perfectly sustain without any outside trade.

Sad for western NWO shills, I know.