The Ruble has declined 8.5% just today as we “speak”. This looks like a very serious collapse of the Ruble. If the Ruble collapses, they can’t as easily buy help from North Korea Iran and China.
With an internal economy already struggling with declining productivity, there is no way I can see Russia last several years in this war anymore.

Common essential goods like Butter, potatoes, eggs and sugar are already declining hard in production, and have increased prices of up to 70% compared to last year.

Russia has struggled to keep up the appearance that the economy is fine, but that boat has sailed now, now we are seeing the cracks cascading, maybe the onset of hyperinflation.

Russia is economically very much a dead man walking now. Yes they may be able to keep it up with the war for months maybe a year, but definitely not several years.