US President Donald Trump blithely tweeted about war again overnight. "Russia vows to shoot down any and all missiles fired at Syria," he posted. "Get ready Russia, because they will be coming, nice and new and 'smart!' You shouldn’t be partners with a Gas Killing Animal who kills his people and enjoys it!"

It was vintage Trump: barely coherent tough guy talk, charmingly unencumbered by traditional notions of what inverted commas are for and which Words Should be Capitalised.