If that were the case then North Korea would have collapsed already.
If memory serves, North Korea gets or got a fair bit of foreign aid.
I'm just gonna say that a cold war wouldn't necessarily come from this. Yes, there would be atomic bombs floating around the fascist and democratic blocs, but fascism didn't hold among its tenets the globalism that communism did, there was no global fascism envisioned, it was a national/state not global ideology. Japan would have been nuked a few times more probably, given that their ally, Germany, would be in some position to help them, maybe not militarily but by other means, and they'd have to take a greater beating to finally surrender.
Fascist block has a difficult time retaking/keeping colonial lands after so many of them achieve their independence following the collapse of their imperial heads. This saps fascist morale and diverts resources, and eventually only a few pivotal colonies are maintained, and these by military occupation.
Many former colonies simply dissolve, and after tribal infighting, more natural borders along ethnic lines arise. This would happen particularly in Africa, the Middle East, and India.
No rise of communism in East Asia given the failure of the USSR and presence of anticommunist Americans rebuilding Asia as they would have for Europe, and many of those nations, without the shackles of western imperialism, form a bloc of their own, partially under the influence of America.
The US wouldn't necessarily have all these debts to collect given that the debtor nations fell and the economy may not be in tip top shape because of it, maybe, maybe not. Franco's Spain would join the Axis powers and conquer Portugal; America seizes the Azores to serve as a naval base to stave off and keep an eye on the European fascists.
Resistance cells in Europe eventually fall, or Europe becomes modern day Syria, with various ethnic and political powers each vying for their own state - Portugal, Catalonia, Ireland, Scotland, Wales, England, Provincial France, Northern France, Mediterranean islands, Baltic and Balkan states, communists, anarchists, etc. Terror attacks in Germany and other German territory increase in number and severity causing Stalin style purges even within its own homeland. Possible uprisings and/or coup d'etat in Germany results. Loyal German forces bogged down by commands to go out of the way to execute political prisoners and Jews as well as fight. Some minor American aid goes to antifascist factions, and whatever Great British faction has the greatest claim to legitimacy.
Europe falls into chaos (much like Russia following the first world war), and some despotic strongman warlords manage to carve out oppressive regimes from this chaos bringing some rather unfree order to Europe. Lots of smaller ones eventually fall to larger ones, and you wind up with a relatively few dictatorial states that dislike each other, but need one another to remain fairly stable lest the instability spread once again.
But that's just my opinion, of course.
