Name a measuring method which proves that "Russia is doing just fine".
Here is an interesting article in the Washington Post about this. Its essence is that more than 90% of Western sanctions against Russia are a fiction. It seems that few Western companies want to lose the Russian market, even declaring the opposite in words. Maybe that's why the effectiveness of sanctions is so low?
There is no problem selling coffee to the RF citizens, nor even providing consulting. That is absolutely fine.
At least now you understand why people in Russia don't take to the streets to overthrow Putin. Very little has changed in their daily lives since the start of the special operation in Ukraine.
Now, try to find the technology you need to produce modern means of fighting and modern means of production and you will know why there are T-55s in the frontlines. What is next? T-34s?
The RF economy is unlikely to collapse big time like a super-nova style explosion. But the erosion is there, as it happened with the USSR: the young and prepared leave, the citizens have to be forced into conscription, growth is stagnant for a BRIC country...
But what is more, things are unlikely to go back to where they were. Putin's war of aggression has permanently damaged RF stance in the world.
I do not think that Russia has any serious problems with the production of modern types of weapons. I don’t know where you got this story about the T-55 from, but this is hardly a mass case, perhaps a single episode, or even a fabrication of Ukrainian propaganda. The Nizhny Tagil UralVagonZavod alone produces several thousand armored vehicles a year, including hundreds of T72B3 and T90M main battle tanks. This is several times more than the entire united West can transfer to Ukraine without compromising its own combat readiness.
False information. The RF is unable to produce "several thousands" of any type of tank, not even 500 per year! On top, lacks the components that make all the difference in the battlefield. You can even produce a T-90, but without the controlling system, good quality night vision and proper support from high-tech requiring combined weapons warfare it means nothing.
https://www.forbes.com/sites/davidaxe/2023/02/17/the-russian-army-could-run-out-of-tanks-in-a-few-years-what-happens-then/https://www.businessinsider.com/russia-demand-tanks-outstrips-production-by-factor-of-10-report-2023?r=US&IR=T#:~:text=In%Daily life has not changed, except for those forcibly mobilised and the thousand of dead RF citizens that died for nothing in a foreign soil, the hundreds of thousands prepared Russians that left the country to avoid the draft, and the mothers of all the dead young and unprepared conscripts.
Winter is coming.
Russia has just one tank factory, which can produce around 20 new tanks every month.
Demand for tanks is now outstripping production by a factor of ten, according to The Economist.
Russia is losing around 150 tanks a month in Ukraine, and is becoming reliant on refurbished vehicles.
It’s a matter of intensive debate just how many recoverable tanks Russia has in storage. Novaya Gazeta estimated there are 8,000 “preserved” tanks. But one open-source analyst counted 10,000 T-72s, T-80 and T-90s in the war reserve.
The problem is, most of those tanks are lined up tread-to-tread in outdoor parks, where they’ve been exposed to rain and cycles of cold and hot that have rusted metal, rotted rubber and degraded sensitive optics.
The open-source analyst assumed just a third of the 6,900 stored T-72s are recoverable. Maybe half the 3,000 T-80s realistically can be restored. There also are a couple hundred new-ish T-90s in storage, most of which should be in reasonably good condition.
So in fact, Russia might have as few as 3,800 repairable tanks in reserve. A Russian source told Novaya Gazeta that Uralvagonzavod and Siberia-based Omsktransmash can restore 600 old tanks a year on top of the 250 new T-72s and T-90s Uralvagonzavod can build.
and the 
