Following the end of World War II, between 1946 and 1991, the United States (US), the Soviet Union (USSR), and their respective allies were locked in a long, tense conflict, known as the Cold War. Although the parties were technically at peace, the period was characterized by an aggressive arms race, proxy wars, and ideological bids for world dominance.
A positive development, which was without precedent in world history, was the flourishing of multilateral institutions following the end of the war, such as the United Nations, the Bretton Woods Institutions, and the Council of Europe. These resulted in a cautious approach based on taking decisions only with the support of majorities, although and in the case of the United Nations Permanent Members of the Security Council were also given the right to veto such decisions.
Gradually, the spirit of cooperation and trust in the 1970s led to the formation of the Organisation for Security and Cooperation in Europe (OSCE), which adopts all decisions by consensus among all participating states. Such an approach is a clear definition of the prevalent trust of that era, in the ability of different parties to put aside unilateral agendas and to address common security issues through multilateral approaches.
The Soviet Union exploded its first atomic warhead in 1949, thus ending the American monopoly on the atomic bomb, a development which would shape international relations for decades to come. This resulted in complete dominance of global politics by the two nuclear powers and gave rise to a bi-polar world order whereby most of the other countries formed strategic alliances with either of the powers, better known as North Atlantic Treaty Organisation (NATO) and the Warsaw Pact respectively.
The possession of nuclear weapons ensured that a large-scale war between the two parties was not likely to break out due to the self-explanatory concept of Mutually Assured Destruction (MAD). However, this period was characterized by repetitive instances of confrontation through foreign intervention by the nuclear powers in fragile states as they sought to install governments which sympathized with their ideology.
While some hailed the possession of nuclear arms as a guarantor of peace and a stabilizer of the balance of power, nonetheless, the Cold-War era posed a serious threat to humanity. Even if direct confrontation was avoided, geo-strategic concerns meant that hostilities could easily escalate to a point of no return. A mistake could be disastrous on an immense scale. The 1962 Cuban Missile Crisis, the highest and most dangerous point of tension between the two sides, portrayed the fragility of the situation. It showed how provocation, miscalculations and miscommunication could easily lead to nuclear war.