Without the sanctions, Russia would have been able to do more harm to its enemies through economic means and otherwise. At this point, they're just looking for ways to survive whatever sanction that gets thrown at them and they've been managing well so far.
The ruble can't go to zero but I get your point. If the ruble goes to zero that would mean inflation will be at about 200% and no country can fight a war and win with that kind of inflation. The price of everything would be so expensive that they would be forced to turn their focus on the economy instead of war.
Let me remind you of history:
USSR being a more progressive and technologically advanced country. In a sense, the USSR had a self-sufficient economy.
The USSR was not technologically backward like modern Russia. The USSR had not only a resource economy, the level of third world countries, as now Russia has.
The USSR waged war for 10 years in Afghanistan, killing millions of Afghans and tens of thousands of its terrorists who went to kill Afghans.
The western world imposed sanctions against the USSR. and in 10 years the USSR ceased to exist !
Nothing is impossible! Especially now the position of Russia is on the back of world politics, its place has been taken by China, China benefits from stability. In fact, no one is interested in Russia, it has shat all over itself and stained itself in everything it can.
Haha gave me a good laugh (as always)
So, it turns out Soviet Union collapsed because of the western sanctions? Mkaaaay
I'm not even sure what sanctions you mean? The 1980 grain embargo?
Indeed, life can be hard with a room temperature IQ...