I think the most important point is the 4th one, but maybe we have developed a weapon in secret, and it is ready for deployment??? Who knows.
As to where to put it (the 5th point), I don't think I buy that. First, intermediate range missiles may prove to be more accurate than ballistic missiles, and they can be forward deployed in a number of ways (land and sea). Plus, if they have to be used in-theater (e.g., against N.Korea), they provide a significant advantage in that they will be much less provocative than launching missiles from Kansas over the North Pole at N.Korea, which would much more likely cause a counterstrike from Russia. N.Korea might not think we would be willing to launch from mainland US, and we may not be willing to do that. We would probably have to use other delivery means.
Since Russia is already deploying its version, point 2 seems moot.
Points 1 and 3 are just global politics. If people want to blame the country calling attention to the cheating rather than the cheater, they will do that no matter what, and they have no real credibility on that point.