It turns out that Harold Wilson’s famous quote, ‘A week is a long time in politics’, is equally applicable to changes to the world order.

So far this week, President Trump has extended a hand to Russia, savaged Ukraine and upended a transatlantic alliance eight decades old. In doing so, not only has he performed a 180 degree turn on established US foreign policy, but he has forced the UK and its European allies onto a new trajectory that will have ramifications for decades, if not longer.