I think the first is quite easy to archieve. Finlandized western europe, stronger soviet influence in the third world, the US becoming increasingly isolated, etc.
This could happen with a POD, at any point in the whole cold war era. Even a POD in the early 80s could result in this. Though Detenté was in my opinion the time, where it would be the easiest.
Finlandizing western europe? Easy? Why in the world would you think that?
Stronger Soviet influence in the 3rd World is... Eh. The 3rd World is poor and generally more of a liability than an asset. And due to the rivalries between 3rd World states, there is just no way for the Soviets to get enough of an advantage here to win. Very few will jump on an anti-american bandwagon just because the Soviets say they should.
And the US becoming increasingly isolated... So? Again, you really aren't appreciating the gap between the Soviets and the US here. The US has an equal population, a lead in most technological sectors, an advantage in the distribution of their natural resources, sets the standards for the world economy due to its economic power and smart diplomacy after WW2, has no natural rivals, utterly dominates its near abroad and has an economy three times larger than the Soviet economy.
The very, very best the Soviets can hope to do is to put the US in the same position they were in OTL, where the US is at a disadvantage and utterly outgunned, but is still powerful enough that they can destroy human civilization if the Soviets look at them funny.
And that's a continuing Cold War with a Soviet advantage, no a victory.
fasquardon