Here's a thing regarding sanctions, even if it doesn't lead to an uprising (which it most likely won't but we live in a clown world), the sanctions will heavily damage Russia's ability to actually field a modern army, the 2014 sanctions are one of the major reasons why the next generation of equipment Russia had been working on like the T-14 and SU-57 have only had around a dozen of each made so far instead of the hundred or more Russia wanted by now, since their economy went into the shitter and made the parts needed to make them more difficult to acquire.
It's why instead of many countries banning that sweet, sweet, Russian oil, they've put sanctions on modern computer equipment and the like that's needed for newer military equipment. This whole "These sanctions will lead to the downfall of Putin" is PR talk, the actual objective is to make them not be able to even think about modernizing their military.