US is interested in democracy/autocracy/communism/(fill in the blank)/military rule as long as it is beneficial to them. As soon as it is not in their interest, suddenly, they don't like it. Examples:
- Egypt democracy was not good because it was ruled by the "Muslim Brotherhood."
- Iran was very good under Shah family (autocracy) because he was aligned with American interests.
- Saudi Arabia (an autocracy) has good relations with US because of US oil interests.
- China (communist) has "good" relations with US because US needs the manufactured goods of China.
- Pakistan (military ruled) during Parvez Musharraf's time had good relationship with US.
The humanitarian reasons for intervention by US are just a facade. The real reason is the military-industrial complex driving the policies.
So, is US interested in a democracy in Russia? Yes, only as long as it makes Russia weak, because that is in US' interest.