here is something my history teacher from last semester(he didnt cover this I get the info back in 10th grade) sent to me when I asked him
Depends on what you call the first steps. We were both so suspicious tat we saw what could have been non-threatening moves as preparations for the other. For instance, the Russians believed the atomic bombs in Japan were really aimed at them---to tell them we were the top dog and they had to do what we said. We saw Russian moves in eastern Europe late in the war and just after as expansions of Soviet power. They were probably thinking of them as self-protective.
In South America are actions often seem warped, but I don't think we were ever in without some type of invite---though we may have stayed after our "allies" wanted us to go.