[whiskyant]

If every country refused to trade with Russia, would it become one of the poorest countries in the world?

[errantmind]

This isn't what is happening nor what will happen, so why ask?

[ComradePhil]

Trade is two-sided and every participant is richer as a result. So, if trade doesn't happen, both sides become poorer as a result.

[jquery]

If I refuse to trade with the world, the world becomes infinitesimally poorer, but I become radically poorer. Russia is relatively small compared to the global economy and will suffer much more than everyone else.