As I've said what's stopping the US from taking over them or the local Russians to cede the islands to the US in exchange from protection from the US?They definitely wouldn't like it, but Uncle Sam will likely want to wash his hands of it all, after the disastrous interventions in Siberia and Northern Russia. Besides, in this scenario, the Aleutians have been Russian for a long time. Soviets or Japanese taking those islands won't be seen as some great strategic blunder, but a return to the status quo (at least in the Soviet's case).