Russia's manufacturing PMI is at, what, 55.9 this month? In fact, the Russian Bank is literally worried about higher than expected inflation because their economic output has been too high.

And of course, by slowly crumbling you mean that one salient near Robotyne? The one that's known to be in a region of low ground surrounded by defences on high ground? That line?

Fact is, so long as India can keep buying Russian oil at whatever price OPEC dictates, Russia can keep financing the war. A lot of Russian industries can function entirely domestically (and thus don't really stress foreign exchange reserves) - the main limiting factor I'd expect is high-tech electronics coming from India and China. Russia's war economy has been remarkably resilient given the circumstances.