Reagan and Gorbachev ended the cold war and removed the threat of nuclear armageddon. Now the neocons, the US budget-dependent (taxpayer dependent) US military/security complex, and the US politicians dependent on campaign funds from the military/security complex have resurrected the nuclear threat.
The corrupt and duplicitous Clinton regime broke the agreement that the George H.W. Bush administration gave Moscow in 1990. In exchange for Moscow permitting a reunified Germany to be a NATO member, Washington agreed that there would be no expansion of NATO to the east. Gorbachev, US Secretary of State James Baker, US ambassador to Moscow Jack Matlock, and declassified documents all testify to the fact that Moscow was assured that there would be no expansion of NATO into Eastern Europe.
In 1999 President Bill Clinton made a liar of the administration of President George H.W. Bush. The corrupt Clinton brought Poland, Hungary, and the newly formed Czech Republic into NATO.