That sounds odd, doesn't it? Yet that is how regimes endanger themselves and those who are in them. Cutting yourself off from the flow of information, goods, and people means that you breed people who are not adept at explaining choices, not adept at choosing things because they are the right things to choose, but because some authoritarian fool made a rule while in the bathtub looking for the soap, or authoritatively interpreted a text he did not understand.
They also endanger other countries around them with this move: India and China, which are not the best of neighbors as it is, only become more nervous when the flow of information that might reassure them is cut off.
What should the United States do? Well, to start with, this would be a good moment for the State Department to start talking to the government of Nepal about changing its position, and restoring democracy. I would suggest that this is exactly where the State Department should focus. Oddly enough, while the State Department has noted the insurgents, they have not spent much time discussing the loss of connection. That, of course, is called "falling down on the job."