 Complete the following phrase:  When the superpowers came close to nuclear conflict during both the Cuban Missile Crisis and the Able ArcherVRYAN Crisis, they developed the view of mutual assured destruction. Andropov was followed as Soviet leader by Konstantin Chernenko, who in turn was followed by Mikhail Gorbachev, and Gorbachev brought a far less hostile, ideological, and reflexively skeptical approach to the relations between the superpowers, helping to build an atmosphere of trust between the two. Reagans views regarding nuclear weapons and ICBMs following this crisis changed, discarding his preconceived notions of general Soviet bad faith, leading him to come full circle and famously declare that Nuclear war cannot be won and must not be fought. These new attitudes on both sides nearly brought about the disarmament and destruction of ICBMs, long-range SLBMs, and, possibly even nuclear weapons themselves at a groundbreaking disarmament 