RE:New threat from russiaI think that was a PR election speech along the lines of "let's make Russia great again. I do not for a moment think the US did not know all that already. There is no reason why President Putin would want to inform the US about their nuclear and missile capability (letting the "enemy" know what you have is simply information that the enemy can use so zero strategic advantage in doing that).
So I suspect a great speech for rallying the troops behind their leader but nothing I am sure the US does not already know and has planned for. Anything launched by humans can be shot down by humans.....it is only technology after all.
Malcolm