US President Donald Trump's social media threats have disrupted peace negotiations with Iran, with the Iranian chief negotiator Mohammad Bagher Ghalibaf accusing Trump of breaching a memorandum of understanding.
Ghalibaf told Iranian state television that Trump's threats were a breach of the agreement, which committed the US and Iran not to attack or threaten each other.
The talks were halted after Ghalibaf's team ended the face-to-face talks, with the Iranian side refusing to continue negotiations under pressure.
US officials defended Trump's comments, saying he was responding to Iranian 'trash talk' and that the posts were not a reason to halt talks.
The incident highlights the challenges of diplomacy with Trump's unrestrained and highly public style, which has been a wild card in negotiations with Iran.
Iranian diplomats have reportedly consulted psychologists to help them understand Trump's mindset and predict his public response to their proposals.
Despite Trump's threats, Iranian officials say the president's tactics have yet to yield extra concessions from the Iranian side.
