Briefly describe the defensive organizations: NATO & Warsaw Impact
Like NATO, the Warsaw Pact focused on the objective of creating a coordinated defense among its member nations in order to deter an enemy attack. There was also an internal security component to the agreement that proved useful to the USSR.
The major similarity, then, is that both of these were organizations meant mainly to defend one side against the other. A major difference was that the Warsaw Pact was also created as a way for the Soviet Union to maintain some amount of control over the rest of its bloc. The pact was created soon after Stalin died.