If Vladimir Putin did help to put Donald Trump in the White House, it would be the ultimate intelligence coup. Yet, it might also prove to be the ultimate own goal. An operation designed to ease the pressure on Mr Putin’s government by installing a friendly face in the White House has instead led to a tightening of sanctions on Russia, and a dangerous increase in the domestic political pressure on the Russian president.

As for Mr Trump, his campaign’s alleged collusion with Russia may have aided his electoral victory at the risk of destroying his presidency. It would be a strange irony if the intimacy of the Putin and Trump camps ultimately ended both presidents’ political careers.

Of course, the Russian government and Mr Trump’s diehard defenders still deny that any such collusion took place. But the US intelligence services are certain that Russia was behind the hacking of Democratic party emails.