Declension wrote:
I vote North Korea. But it depends what you mean, of course..... at the moment, North Korea is mostly only a threat to its own citizens.
However, if we change the question slightly, and ask "What is the scariest country?" The answer has to be the USA.
The USA is ridiculously powerful, and to make matters worse, its politics are getting closer and closer to blind nationalism. Defeating a fascist USA would be almost impossible without using horrific weapons.
Yes- the question has two possible meanings- worse to their own people, or worse to the outside world.
We all seemed to agree that North Korea is most tyrannical to its own people.
Saudi Arabia is a contender for distant second. Pakistan has some of the worst aspects of both tyranny and anarchy and allows remote areas to be ruled by the Taliban who shoot school girls.
But foriegn policy wise the USA and China are the worst bullies (though not the only ones). But the USA has not actually invaded and occupied a country lately. And China isnt really that bad either yet.
So there are no real foreign policy villians on the scene right now. But competion between global powers is heating up.
The nasty civil war in syria has become a chessboard for the outside powers: Russia, China, and Iran, on one side backing Assad. And with Nato, the Arab League,and both the USA, and its friend: Al Queda backing the other (not the first time that the last two were unwiting collaborators). Kinda like that other brutal civil war-the one in Spain in the 1930's that drew in involvement by Germany, and Italy on one side, and both Stalin, and the western democracies on the other in a "dress rehearsal for World War Two".