US President Donald Trump has warned Iran the 'clock is ticking' as talks to bring the war to an end have stalled. 'They better get moving, FAST, or there won't be anything left of them,' he wrote on his Truth Social platform. 'TIME IS OF THE ESSENCE!' The message came as the president spoke with Israeli Prime Minister Benjamin Netanyahu on Sunday, the Times of Israel reported, citing Netanyahu's office.

On Monday, Iran stated it had responded to the latest US proposal and that exchanges with Washington were ongoing through Pakistani mediators. 'As we announced yesterday, our concerns were conveyed to the American side,' the country's foreign ministry spokesperson said at a media briefing.

Iranian media earlier reported that the US had failed to make any concrete concessions to Tehran, with the semi-official Mehr news agency stating that a lack of compromise would lead to an 'impasse in the negotiations.' Trump's message echoed his previous threat that a 'whole civilisation' would die unless Iran agreed to a deal to end the war, shortly before the ceasefire was announced in early April.

The president warned earlier this week that the truce was on 'massive life support' after rejecting Tehran's demands, labelling them 'totally unacceptable.' Esmail Baghaei, an Iranian foreign ministry spokesperson, then insisted they were 'responsible' and 'generous.'

Iran's semi-official Tasnim news agency reported that the Iranian asks included an immediate end to the war on all fronts, a halt to the US naval blockade of Iranian ports, and guarantees against further attacks on Iran. Furthermore, they demanded compensation for war damage and emphasis on Iranian sovereignty over the Strait of Hormuz.

According to Iranian reports, the US had set five conditions in response to Tehran's proposal, demanding that Iran keep only one nuclear site in operation and transfer its stockpile of highly enriched uranium to the US. Trump suggested on Friday that he would accept a 20-year suspension by Iran of its nuclear programme, indicating a shift in position away from the demand for a complete halt.

Israeli and US forces began massive air strikes on Iran on 28 February. The ceasefire meant to facilitate talks has largely been observed despite occasional exchanges of fire. Iran has continued to control the Strait of Hormuz, effectively closing this vital waterway, which transports around 20% of the world’s oil and liquefied natural gas, causing oil prices to soar globally. The US is enforcing a blockade of Iranian ports to exert pressure on Tehran to agree to its terms. While Pakistan plays a mediator role, substantial differences remain between both sides.