Trump can blow hot and cold on Putin and Russia in tweets, just as he did in the course of one day on Wednesday, first threatening Russia with "nice and new and 'smart'" missiles and then saying there's "no reason" for the U.S.-Russia relationship to be so bad. But Americans should be used to the low price Trump puts on the meaning of words. He, like many habitual social network users, employs language to communicate emotions rather than precise messages.