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Let's begin by saying this: the list is right, Putin is clearly the most powerful person in the world right now. However, the Forbes list shouldn't be a shock - it's correcting itself.
The shift in Forbes' rankings seems to come from a perceived increase in Putin's use of his power on the world stage; offering a home to NSA leaker Edward Snowden, for example, or his hard line approach to Syria talks. While some, such as Ian Bremmer, have cast doubt on the true significance of these victories, it's hard to deny they're at least a PR coup.
Even if we trust this factor, however, it seems to be a misunderstanding of how true
The United States is clearly a far larger economy than
Meanwhile, China may be an autocratic state, and Xi Jinping (and predecessor Hu Jintao) may have the same title as Putin, but his power is severely limited by the nine-person Standing Committee of the Politburo, on which he is only first amongst equals. "[A Chinese president's] power is far less than the power of the U.S. president," Cheng Li, a senior fellow at the Brookings Institution told Bloomberg last year: By deduction, that's far less than Putin.
There have been serious challenges to Putin's power in recent years, but he has remained at the top of one of the world's most powerful countries for 14 years, outlasting many autocratic leaders from older generations (Qaddafi, Chavez, etc). It seems safe to assume that not only has Putin been the most powerful person for a number of years, but also that he will probably remain in that position for some time.