Edward Luttwak examines the unusual dynamics of US-Russian relations and how they could change in the future.

Andrew Roberts discusses Europe’s flagging commitment to NATO, the potential threat from Russia, and what, if anything, the United States can do to arrest the decline. (Playing time: 13:23)

Josef Joffe describes how Europe lost the fighting spirit, whether it can get it back, and why the United States hasn't suffered a similar fate. (Playing time: 15:59)

Angelo Codevilla on how Europe has transformed from a dominant geopolitical force in the wake of World War II into a militarily weak region. (Playing time: 15:18)

Cornell University professor Barry S. Strauss examines how North Korea's history influences its modern strategic calculations.

The American Enterprise Institute's Thomas Donnelly examines what North Korea hopes to gain through its nuclear weapons program.

Peter Mansoor argues that radical Islamists are driven by the desire for a new caliphate and that their tactics make realizing that goal impossible. (Playing time: 10:10)

Josef Joffe contends that the desires of radical Islamists can’t be understood within the context of conventional, politically motivated terrorism. (Playing time: 10:52)

The Council on Foreign Relations’ Max Boot looks at historical lessons in understanding the motivations behind radical Islam. (Playing time: 14:31)

Hoover senior fellow Victor Davis Hanson discusses a new online journal that analyzes ongoing issues of national security in light of conflicts of the past—the efforts of the Military History Working Group of historians, analysts, and military personnel focusing on military history and contemporary conflict. (Playing time: 15:56)