From 1984 "If you want a picture of the future, imagine a boot stamping on a human face — forever."
How can things change, then? An invasion is not better than a revolution. Economic pressures work for most countries today (not e.g. North Korea) but not for oil countries -- note that most problem states do live on resource exports (see resource curse).
How do you think about this:
You should not help dictators based on natural resources economically. Countries built on industry will have to democratize when they reach a certain economic level. Countries who get their money from natural resources will just generate more money in Swiss banks if the prices increase.
Edit: pcj50, I doubt even the Saudi A king describes his country as democratic. The West is enough dependent on them that they get a free card. Realpolitik in a democracy means being nice when it isn't too expensive (or the voters back home cares). Dictators are even worse. In sum, there are only varying levels of grey, no black/white. But, well, you knew all this.
The only way to push democracy to such a big and advanced country is to increase cultural exchange, encouraging tourism and supporting Russian education system.
The only two ways I can see his regime could be defeated are:
* Turmoil within his ranks leading destabilizing his power structure
* Significant economic downturn (e.g. oil price falls or oil trading is hindered by sanctions)
One could argue that the growing discontent with Putin among the younger generation could lead to his demise, but I don't think it would work. They can protest all they want but as long as 90% of the population are successfully hypno-toaded, Putin can deal with the protesters in any way he wants.