A more likely prospect is more crapulous fawning over an autocratic leader who exercises a mysterious hold over Trump and, most Nato members believe, threatens European security.

As with Kim in Singapore, Trump’s big day out with Putin in Helsinki will be noisily declared, by him, to be an outstanding success contributing to global harmony. If, as is suggested, the two men agree to extend the New Start nuclear arms treaty, that will be a rare plus.

But just as likely are unilateral, Nato-busting Trump moves to ease sanctions on Russia over Ukraine, a deal to keep Bashar al-Assad in power in Syria, the “normalisation” of Putin’s regime, and other concessions undermining the post-Salisbury western consensus.