Russia could have done that at any time, long before invading Russia. Just ban all imports - although that necessarily means banning exports too. Of course, there are some very good reasons why that would have been stupid, as Russia is going to find out.
Maybe.
We will see.
I don’t support the Russian regime, but I do see Russians as largely innocent victims in this.
Assuming that Putin is being nationalistic and no other intent, he may have allowed globalism a foothold in order to learn from the West for economic development purposes.