Can anyone stop Donald Trump?

International law? No, “the only thing that can stop me” is “my own morality”, Donald Trump told the The New York Times earlier this month.

It was the “most blunt acknowledgment yet” that the US president believes he has the “freedom to use any instrument of military, economic or political power to cement American supremacy”, said the paper. As Trump holds court in Davos today, Europe’s leaders should be in no doubt of his conviction that “national strength, rather than laws, treaties and...