The PM won’t call out Trump over Venezuela, and won’t commit to Europe. His refusal to choose leaves vital choices for Britain to be made by others

For an inveterate liar, Donald Trump is remarkably honest. The best guide to what he thinks is what he says. When forecasting his likely course of action, start with his declared intentions – removing the president of Venezuela, for example – and assume he means it. When he says the US must take possession of Greenland, he is not kidding.

The motives are sometimes muddled but rarely hidden. Trump likes making deals, especially real estate deals, and money. He wants to be great and to have his greatness affirmed with praise and prizes. He craves spectacle. The world as he describes it doesn’t always resemble observable reality, but there is an effortless, sociopathic sincerity to his falsehoods. The truth is whatever he intuits it to be in the moment to advance his interests and manipulate his audience.

Rafael Behr is a Guardian columnist