We can not have a candid talk about this issue. My view is based on reality, what have happened. Your view is based on abstract principle and then you tried to find facts to fit your principle. But you missed a lot of facts. The biggest fact is a so-called defense military alliance made so much eastern expansion after cold war ended The temporary balance of power (1991 -1999) of post cold-war was destroyed by neo con/neo lib.
What I don't understand is you know the Cuba missile crisis and 60 years' blockade of Cuba ports even since. (I fully support U.S' stand toward Cuba. I also fully support spirit of Monroe doctrine, i.e. latin America is special to U.S. a backyard of U.S.) Why is it so hard for you to understand when the shoes on others' feet? i.e. on Russia's feet?