Yeah, but they can't sell those resources. Their currency is crashing. They're dealing with massive inflation. And I didn't even mention the fact that Russia's miles-long convoy basically stalled and still hasn't made lots of advances. Can Russia level Ukraine with missiles? Oh sure, absolutely - no debate. But to truly take over a country, you have to occupy it. And occupying a foreign country requires years - even decades - of commitment. If Russia's struggling this hard to conquer a comparatively weaker neighbor, they can't reasonably expect to occupy and control Ukraine for an indefinite term.
Exactly my point. Yes, Kyiv could fall, but it's not enough to make a capital fall or even replace a regime -- did we not learn anything from our adventures in Baghdad and Kabul?!
They're going full-Stalin, and there's only so much they can do. They're invading a country that has an identity that tens of millions of people are willing to die and *kill* for. And unlike Nazi Germany, Russia is fighting this foe alone, and it's fighting this foe against a united global effort to punish her economically. So WWII parallels are inaccurate, IMO.
Why would they need to sell those resources? You literally must never have unsderstood war time economies or the communist economy, russia is self reliant enough it can produce almost everything it needs, very few nations on earth can say the same. You make it sound like russia can only function with us dollars, but the soviet union proved that wrong by having a bigger navy and air force and army the the united states or nato despite being economically isolated.
Holding ukraine takes forces, but russia still has plenty, their active force is about 1 million and their reserves are over 2 million, if they wanted to they could allow reserves and conscripts to fight in ukraine, and numerically if russia wished they could force millions more into service, you grossly underestimate the russians.
Kyiv will fall, but I feel it will be among the last to fall, russia is hoping for a surrender, because even with all the heavy bombing and shelling, taking an urban center like kyiv would have heavy casualties on both sides, no matter what army tried to invade it, they are trying to surround them to force them into surrender rather than trying to push to invade it head on, knowing they may lose tens of thousands of troops with ukraine losing possibly almost 100k troops and mass civilian casualties. It is not rocket science to realize the russians screwed up by not going hard and fast and they gave ukraine time to retreat forces to urban centers to focus on urban combat, russia is trying to surround them to avoid epic bloodshed both ways, but looking at how the russians feel, if starving them does not work they may move for epic bloodshed.