What happened to the Soviet Union happened mainly for domestic reasons. It was a failure of the model based on a command economy and dictatorship. The rejection of freedom and democracy, the decisionmaking monopoly of one party, and the monopoly of one ideology all had a chilling effect on the country. That model turned out to be incapable of making structural changes. It did not open up ways for initiative and was overly centralized.
Mikhail GorbachevPlease remember one lesson of the 20th century. One cannot force happiness, impose happiness on nations by imposing any kind of utopia on others. The Communist model of society was a kind of imposed utopia for which the Russian people in particular paid a great price. Still, sometimes we see that attempts are being made to impose some other kind of model on the entire world - maybe a Westernized or Americanized model... This is not the way to go because this can only create conflict.
Mikhail GorbachevIt is my firm belief that the infinite and uncontrollable fury of nuclear weapons should never be held in the hands of any mere mortal ever again, for any reason.
Mikhail Gorbachev