I’m not convinced the US could react as rapidly as we are lead to believe. The whole land based nuclear force has deteriorated. It was the place for the top guys 40-50 years ago. Now it’s the last place anyone in the Air Force wants to be stationed. Things wlll go wrong and not work, lots of maintenance items will suddenly appear. Plus before an missile attack is launched a cyber attack will come first. Who knows what systems can be disabled, certainly the White House willcome under heavy attack. Last month a portion of their systems were hacked. If the cyber attack disrupts communication the nukes won’t fly. It used to be they launch, we launch, everyone dies. Now I don’t see it being so cut and dry.