Containment is where you limit. For example when Korea had a border it was to stop communism on onside of Korea thy had to limit it.
The iron curtain is a barrier that separates communist Europe from Non- Communist Europe. For example well when Europe put the wall up to separate communism.
Stalemate is when war is over and neither side wins. For example at the end of the Korean War neither side won.
A demilitarized zone id when it is in one place where military is not allowed for example during the Korean war both sides agreed to a demilitarized zone.
A dente is easing of Cold War tensions. For example they started a treaty the one with the ABM sites one part protected the national capital the other protecting the other a long missle site.
An arms race is when nations compete to build more and powerful things for example when The Soviet Union and the U.S were creating things and the S.U built a satellite and the U.S sent a man to the moon.