I agree that Russia isn't "dependent" on the west. Again going back to my OP I assert that this is a non-factor for Putin as he seeks to create a Russian-lead Slavic ethnostate in Ukraine, Russia, Belarus, Baltics, and more. Ukraine is a key piece not for security reasons - again Russia has 6,000 nuclear weapons and if you feel insecure than you are actually irrational - but because of the extensive amounts of resources which he'll need to feed the Russian people and create industry. Russia has all the resources it needs, they won't have iPhones but they'll build rockets and cars and stuff like that.
Since, as you point out, the consequence of invading the Ukraine has been to cause a lot more troops to be deployed in the Baltics and other places you say Putin wants to eventually conquer, I don't see how this "Slavic ethnostate" is a rational goal.
I agree that the resources in the Ukraine are a rational goal, but if that is Putin's goal, we would not expect him to invade other countries. The resources in the Ukraine might be worth what it will cost Russia to get them (or at least that might be how Putin has calculated it); the resources in other countries, particularly NATO countries, would not.
I just have such a hard time thinking he invaded Ukraine just to get resources. Or just for security.
I'm not sure that's true. But that may be because I have a different view of Ukranian internal politics than you do. See below.
> Why?
Because, first, I don't think Russia's economy is all that dependent on the products that Western sanctions would cut off, and second, I don't think the sanctions are going to be all that well enforced long term, since that is the way sanctions usually are. (And I expect Putin thinks that too.) For one thing, Europe is dependent on some key products from Russia, such as the natural gas that is now not flowing. Past experience suggests that European countries will find ways to route around the sanctions while publicly giving them lip service.
> a country that definitely doesn't want him there and is now pissed off
Some Ukranians are. I'm not so sure a majority of them are, at least not in any sense that matters for Russia. Eastern Ukraine, in particular, I think is generally sympathetic to Russia.