Barack Obama and Vladimir Putin's relationship has always been, shall we say, fraught, but on Monday they shared a toast at the United Nations that looks to have been, even by their high standards, pretty weird. There's so much to take in here. The nuclear powers side-eye. Putin's almost triumphalist smirk; Obama's undisguised loathing (there's an unmistakable "let's get this over with" look on his face) of the man with whom he's touching glasses. The discrepancy in size between the two men — look at how much farther Obama's arm reached than Putin's — adds another layer to it all....