The Race That Can’t Be Won 

I don’t actually think that the prospective nuclear standoff is any more dangerous than the first one. There are currently five nations with the capacity to build unmanned nuclear powered submarine launch platforms which could crawl undetectably to within just a couple of hundred miles of any nation with a shoreline and thence deliver low flying hypersonic steerable drones against which there is no plausible defense. Once these are in place, any devastating attack against any of the nations that own them brings assured destruction on the perpetrator. It may be MAD but so long as all parties understand that it really exists it may actually deter direct aggression just as well as it did in the last century.

Source: The Race That Can’t Be Won | Portside