Apparently by working hundreds of thousands of gulag prisoners to death:
https://www.dailymail.co.uk/travel/travel_news/article-63332...
The VAZ factories were built by the Italians, and the early Shiguli/Lada car models were phased out Fiat models.
The MiG-15 prototypes famously flew with English jet engines.
The Tu-95 turboprop engines have been designed by Germans.
Etc etc... my point being that self-sufficiency doesn't work in the modern world (unless the people are content with living like medieval peasants).
Yes, because they used to have local factories and mines that they built up over decades. Then as globalization and direct international investments were encouraged instead of trade, factories and mines were closed down and production moved to China/India/S Korea/Japan/Taiwan etc. Going to the point that cloth masks couldn't be produced in any significant numbers in the USA or Europe when a pandemic hit.
Enough wood? I live in a forest.
Tens of millions... Sorry, this state has 50 people per square mile. There aren't 10 million people within a 100 mile radius of me.
Supply chain? They didn't have an international supply chain 100 years ago. They barely had one 50 years ago. The world will be fine without one for awhile.
You are just not correct on any level here. People were trading and able to survive perfectly fine and even thrive 2000 years ago, with iron age technology and not much of that. 1 year after a nuclear war people would be rebuilding, 10 years after and day to day life will be very much like it was before the war.
Here is a map of the amount of rail in the Soviet Union in the 20th century. https://upload.wikimedia.org/wikipedia/commons/thumb/5/54/Ra... You can see that they went from basically 0 rail to a massive amount of rail in 20 years. How did they do this without a global supply chain and while fighting 2 world wars? It turns out people are more than capable of addressing problems even under trying circumstances. They don't just say "supply chain disruption!" and give up and lay down and cry.