Staying power: the world's longest-serving leaders

Following the announcement by Cambodian Prime Minister Hun Sen that he was stepping down after nearly four decades in power, here are the world's longest-serving leaders, except for monarchs.
- 40 years plus -
Equatorial Guinea: The Soviet Union was still a decade from collapse when Teodoro Obiang Nguema came to power in a coup in the west African state of Equatorial Guinea in 1979.Russia: Putin became prime minister in August 1999, then president the following year, and served two terms before

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