I’ve studied that quote in context, he doesn’t regret the fall of the Soviet Union, what he lamented is the way it was handled. And he has some legitimate points there. Here is another Putin quote:
“Russia has made its choice in favor of democracy. Fourteen years ago, independently, without any pressure from outside, it made that decision in the interests of itself and interests of its people — of its citizens. This is our final choice, and we have no way back. There can be no return to what we used to have before. And the guarantee for this is the choice of the Russian people, themselves. No, guarantees from outside cannot be provided. This is impossible. It would be impossible for Russia today. Any kind of turn towards totalitarianism for Russia would be impossible, due to the condition of the Russian society.”