I find this line of thinking rather fascinating. We Americans tend to think that we are so powerful and influential that should anything truly awful befall us we'll have many countries, or some countries, or a few at least coming to help us.
And maybe I'm just cynical, but I really don't think they will. If we were suffering from environmental disaster that were devastating and widespread then our value as a natural resource is damaged. With the loss of population we lose our manufacturing and with that our ability to trade. With the loss of science and rational thought we lose innovation and progress.
America in these circumstances would be far less valuable to maintain and support... and if she falls under what we from the show there really isn't that much incentive to go help. Which means we rely on the milk of human kindness, on the intervention of others on a moral basis.
Humans will let each other oppress, torture, and murder each other on a national level for generations without lifting a finger. There really isn't much by way of human kindness in terms of international intervention.
This is why the idea that given time the Martha's and Handmaid's and Econowives and the men who don't get "assigned a woman" won't successfully rise up... not for a long time. Again, North Korea... the entire country is full of walking wounded, people traumatized, generations starved. The psyche of North Korea has been forever marred because of the grueling decades of a fascist regime. What do you think the psyche of women in places like Afghanistan must be like? How many generations will that follow them...? I suspect the same will be seen with Gilead. Decades, generations of women oppressed and powerless.