Vance snaked his way in first to the row between Trump and Zelenskyy, his second intrusion this month after Munich

JD Vance was supposed to be the inconsequential vice-president.

But his starring role in Friday’s blowup between Donald Trump and Volodymyr Zelenskyy – where he played a cross between Trump’s bulldog and tech bro Iago – may mark the moment that the postwar alliance between Europe and America finally collapsed.