President denies visit was to gain support for Iran sanctions or due to fears that Putin plans to ‘test Nato resolve’

• US politics live – latest updates

Donald Trump has downplayed a visit to Moscow by the CIA director, John Ratcliffe, as “semi-routine” after he turned up in the Russian capital unannounced, triggering a wave of speculation about the reasons for his trip.

Ratcliffe was reported to have flown to Moscow on a government transport plane on Tuesday in a rare visit after taking off from the Andrews air force base in Maryland.

Everyone can see that the Iran war has been a strategic disaster for the US, while a failing president pretends he is winning

Now is the twilight of Donald Trump’s supremacy. The US is still the richest and most heavily armed nation on Earth. That status is secure. The current president, contemptuous of law and indulged in lawlessness by a supine Congress, enjoys even greater power than the constitution allows.

With those advantages it takes a special talent for incompetence to look as thwarted and impotent as Trump does with more than two years of his second term still to run.

Rafael Behr is a Guardian columnist