US President Donald Trump has said that “we’re not flying anymore with 18-hour flights every time we want to see a piece of paper,” adding that negotiations will be conducted over the telephone.

“I always like face-to-face … but when you have to fly 18 hours every time you want to have a meeting … and you know they’re going to give you a piece of paper that you don’t like before you even leave,” he tells reporters.

Trump adds that Iran has “come a long way”, but questions whether or not “they’re going to go far enough”.

“At this moment, there will never be a deal unless they agree that there will be no nuclear weapons,” he states.

Asked whether the US naval blockade of Iran would last for several months, Trump has said that Tehran has been defeated “militarily”.

“Now they have to cry uncle, that’s all they have to do. Just say ‘we give up’,” he says.