"beats any arms supplies possible"

Very observably not. Russia seems to be actually incapable of buying any modern weapons for the billions of euros it receives from Germany. Even China considers such cooperation too risky.

The technical level of Russian equipment deployed in the battles in Ukraine has gone downhill since February. Now they are pulling really old stuff (designed or even manufactured in the 1950s-1960s) from storage. And some of their auxiliaries from the separatist republics literally use WWI and WWII small arms.

Money matters in war, but it cannot substitute for a missing/inadequate supply chain. You can't bury the enemy in an avalanche of euros, you actually need to procure the necessary equipment.

There is no need in sophisticated weaponry or even artillery when you have endless literal cannon fodder. Hide or deny losses and drag on just enough to exhaust your opponent.

A year of slow territorial gains? Two? More? Not a problem as long as economy is propped by European money, Germans don’t bother sending enough weapons and Western media is tired of war and looks elsewhere.

Russia already had poor demographics before and now it is possibly spending years losing military age males?

Russia as a low prospect J-curve state might not be entertaining to the western media but it is basically the outcome the US has been gunning for since Gorbachev left, always with a lot of resistance from Germany. After a few more years of setting up alternative gas routes, I'm not sure Germany will even have a way to offer Russia yet another chance.

Russia doesn’t have endless cannon fodder. And has had a lot of difficulty sourcing troops. They are fine losing troops but their army isn’t as big as people imagine. And the logistics needed to get people to the front with basic supplies is hard.

Russia is itself the 2nd supplier of weapons on the international market and buying from the 1st (the US) is pretty pointless as whatever the US is selling is incompatible with the Russian systems. Who you envision Russia would need to buy weapons from?