A global coalition of former military leaders and diplomats who had responsibility over nuclear weapons is launching a "shadow security council" to offer advice to world leaders on how to reduce what they consider to be the growing danger of a nuclear conflict fueled by the rhetoric of President Donald Trump and destabilizing moves by Russian President Vladimir Putin.The Nuclear Crisis Group, which will be announced in Vienna on Friday, boasts nearly two-dozen members of the nuclear priesthood of at least eight major nations — including a former commander of the U.S.