Question: do HN-ers think that Russia and /or China have the capability of, say, shutting down our grid or water supplies? The army would have to restore order

Question: do HN-ers think that Russia and /or China have the capability of, say, shutting down our grid or water supplies? The army would have to restore order https://en.wikipedia.org/wiki/New_York_City_blackout_of_1977#Effects https://en.wikipedia.org/wiki/New_York_City_blackout_of_1977... I think they do, but we can return the favor.