On one level, the officials said, he is something of a laughing stock among Europeans at international gatherings. One revealed that a small group of diplomats play a version of word bingo whenever the president speaks because they consider his vocabulary to be so limited. “Everything is ‘great’, ‘very, very great’, ‘amazing’,” the diplomat said.

But behind the mocking, there is growing fear among international governments that Trump is a serious threat to international peace and stability.

“He has no historical view. He is only dealing with these issues now, and seems to think the world started when he took office,” a diplomat told BuzzFeed News, pointing to Trump’s remarks and tweets about defence spending. “He thinks that NATO existed only to keep the communists out of Europe. He has a similar attitude in Asia-Pacific with Japan, ignoring that the US basically wrote their constitution.” During his presidential campaign, Trump called out Japan to pay more for the security US provides, including for hosting the US troops in the country. Japan’s constitution restricts its military options.

They also believe Trump’s foreign policy is chiefly driven by an obsession with unravelling Barack Obama’s policies. “It’s his only real position,” one European diplomat said. “He will ask: ‘Did Obama approve this?’ And if the answer is affirmative, he will say: ‘We don’t.’ He won’t even want to listen to the arguments or have a debate. He is obsessed with Obama.”