What would you think if Russia did this to your country? Supported the oligarchs in your country... to make you see the error of your ways?
Btw west itself is not Liberal Democrat. Checkout Russian Liberal democrat Vladimir Zhirinovsky you'll see how different Russia is from West. I feel like you expect a western solution to a Russian problem. Im dont expect everyone agree with me, but to me it seems like this problem needs some extreme (not normal) approach
The west has a terrible history of implementing these kind of self defeating, counter productive Strongman strengthening policies (e.g. Putin is largely result of the west supporting with Yeltsin), which is what I think would happen if you were to "teach the people a lesson" which if I'm not reading you wrong, seems to me, what you are suggesting.
Also, the question stands, what do you think the effect of your suggestion on the average Russian? Do you think they will see things your way, or will they (in some sense rightly) see this as patronising interference. How would a western person see it if Russia were to do this to their country?