This is not correct. It heavily depends on where you live. Do not forget that only ~40 (IIRC) countries introduced some sanctions against Russia. In the rest of the world, business with Russia is running. The disconnection of majority of Russian banks from SWIFT is a problem; but solvable. (Do not forget that an international trade is much, much older than SWIFT.)
What P2P trader? Russian? Yes, now it is probably possible. And probably even after the abovementioned ban, as the ban targets only using crypto for payments, investing in crypto is still allowed – if I read correctly.
But I really do not think the idea that a free market and underground markets can sprout like mushrooms is now generally valid for Russia.
Bottom line: May I ask you one short question? Do you have a personal experience, direct or indirect (i.e. from your close friend or business partner) with living and/or running business in Russia for a sufficiently long time? (And take into account that Russia is not only Moscow and St.Petersburg, the majority of Russian population lives at province.)
If yes, then – we simply have different opinions. It can happen.
If no – sorry, but in such a case you do not know what you are talking about. Russia is not the US, not Europe, not Japan, not Africa. It is a different environment. I do not want to say that it is horrible or excellent; just different.