Photo Gallery: Searching for Deterrence 04/07/2014
 During the Cold War, peace in Europe depended largely on mutual deterrence....
DPA

During the Cold War, peace in Europe depended largely on mutual deterrence. Since the collapse of communism, however, Western militaries have changed focus. The Ukraine crisis has some wondering if that was a mistake. Here, German Defense Minister Ursula von der Leyen posing with German troops in Afghanistan.