Nuclear weapons are a double edged sword. You can use them but then you'll also be dead. Russians know it and it's not like Putin can press a button and we all die. It has to go through the chain of command and according to various sources within Russia the army does not and will not support the use of nuclear weapons. It would be suicide and the longer the war takes the more suicidal it's going to be for Russia because NATO is planning to set up a patriot missile defense perimeter along the border with Ukraine and Belarus. Best case scenario Russia can hope for after that is that they're able to sneak out a submarine somewhere around the North Pole and hit Britain and France from up there. If this fails any launch from their territory will be a death sentence to millions of Russians.
At this point Russian economy is dead. It will hurt the West because a war is draining all economies, but it's draining Russia 5 times faster. In the end Russia is going to be like North Korea with people surviving by eating grass and walking in patched clothes, driving old, rusty cars and acting like it's all good because it's the West's fault. China won't help them because weak Russia is going to be much easier to handle. The big winners in the long run will be countries like China and India that are staying away from the conflict and may even profit from weak Russia. If Ukraine survives, the EU and NATO will also become stronger. NATO will get Finland and the EU Ukraine.
I agree with some of your statements that the sanctions will weaken Russia both in the short and long term. However, Russia and China have been working on their own CBDCs to circumvent the US dollar supremacy. Therefore, they will use their own settlement systems with Russia. I agree that China and India will benefit most as they can middleman out Russia's banned resources for sale just as North Korea sells their coal to China. Sanctions are pointless just like the war on drugs the counterparty will always find a way to circumvent them.
Wasn't Venezuela our enemies? At this rate the US might have a chance of becoming Venezuela under Biden and the Globalists. Venezuela was their testing ground and they'll use their tactics to experiment on us further that is the the boil down from everything the elite do to the masses:
Biden admin courts Venezuela as Russian economy takes hits from sanctions: report
https://www.foxnews.com/politics/biden-admin-venezuela-russian-economy-sanctions