On “60 Minutes” CBS News national security correspondent David Martin took a deeper look into the threat and risk of nuclear war as Russia and the U.S. build their nuclear arsenals for deterrence. David Martin and director of the Nuclear Information Project at the Federation of American Scientists Hans Kristensen join CBSN to discuss. Note: Bear in mind this video feature was produced 4 yrs ago and since that time, U.S. technology has made astounding advances in that time span!