There was the dissolution of the Soviet Union. But the cold war didn't really end. If it had, and Russia was no longer a threat, we wouldn't have, or need, NATO.
@bigheadfred IMNSHO,China is a MUCH more serious threat these days than Russia.
For one thing,Russia has a dwindling population,which means fewer soldier to soldier,and fewer workers to produce war materials.
China,on the other hand,is completely out of control,"Population wise".
Frankly, I am shocked they haven't already started a hot war with the west so they can get some of their soldiers killed off so they don't have to feed,clothe,provide medical care,or house them.
If they don't figure something out soon (from a historical POV) food riots and violent revolution are as certain as the sun coming up in the east.
I seriously think the only reason this didn't happen decades ago is because there is no such thing as a Chinese citizen of today that has ever known anything BUT communism.
The problem for the Chinese is the same as the problem for the Russians. Namely,this is no longer the 30's or 40's,and there is no way they can completely shut down news from the west. I honestly thought a Revolution there was a sure thing when the Tineiman (sp) Square flare-up happened,and Chinese students and citizens stood up to Chinese tanks and refused to budge. They had the courage to spare,but they just didn't have the knowledge necessary to create a full-blown uprising,and their masters waited until things had calmed down,and then arrested and executed the known leaders.