Sorry, you want me to write a WHAT?!
The thing is, we can't really write an essay or do *all* the leg work for you. Instead what I can offer are some ideas or talking points for your essay.
For one, the Berlin Wall was something that escalated tensions. There was even a blockade that prevented Berlin from getting supplies, and the West responded with the "Berlin Airlift," a massive operation to deliver supplies by air.
Second, both sides feared each other or hated each other because of opposing ideologies. Communism and capitalism can be seen as direct opposites of each other to simplify things.
Vietnam began in 1965, and lasted for 10 years in a foreign land where most GIs died horrible deaths.
In 1967, a Soviet submarine, K-129, went rogue and almost started World War 3.
During the tense weeks of the Cuban Missile Crisis, political officer Ivan Semyonovich Maslennikov prevented the launching of Nuclear torpedoes in 1960, as the Captain thought the war had started when practice depth charges were dropped on the submarine by Americans attempting to get them to surface.