Mainstream sites

Federation of American Scientists : An awesome site, full in-depth analysis on key World Strategic issues such as Space exploration, Nuclear technology, and full coverage of all military movements across the globe.

Global Security : Devoted to matters of world security. Full of attitude and endless data. The writers on this site are not afraid to speak the truth, and give predictions/explanations for the underlying trends currently underway.
 

Unconventional sites

From the Wilderness : A general news/world overview site, tinged with a lot of conspiratorial attitude.