In a thread about Russian expansion and the resumption in full flower of the cold war, you're asking which part of The End of History has proven to be flawed?
Nonetheless, the book's thesis is hard to reckon with:
> What we may be witnessing is not just the end of the Cold War, or the passing of a particular period of post-war history, but the end of history as such … That is, the end point of mankind's ideological evolution and the universalization of Western liberal democracy as the final form of human government.
And it is always possible that Putin himself has not read (or, like so many of us, merely misunderstood) Fukuyama's work as well.