17 February 2012, 20:19
Mutually Assured Destruction, IE both sides have enough nuclear weapons and automated launching systems that if country A attacks country B and wipes out its government , military and command and control systems, country B still has enough nukes in Subs , bunkers, on planes, in silos etc ready to launch that even if Country B is wiped out, only 6 minutes later country A is also wiped out.