President Donald Trump has warned Iran there "won't be anything left of them" as the ceasefire deadline looms.
The US President took to social media to issue his latest caution, writing on Truth Social this afternoon.
He wrote: "For Iran, the Clock is Ticking, and they better get moving, FAST, or there won’t be anything left of them.
"TIME IS OF THE ESSENCE!"
The two nations are currently engaged in peace talks whilst a fragile ceasefire agreement is in place.
A US-Israeli operation against Iran started on February 28, in which air strikes throughout the Middle East ensued, pulling in other nations into the conflict.
Tehran and Washington have since agreed a ceasefire, which was established last month to facilitate peace talks.
However, it appears the two nations are no closer to striking a deal.
Mr Trump speaking from Air Force One on Friday after returning from Beijing
|GETTY
The semi-official Iranian news agency, Mehr, said today a lack of compromise on the US's part would lead to an "impasse in the negotiations".
Mr Trump said earlier this week the ceasefire was on "massive life support" after Washington rejected Iran's demands.
He labelled the Iranian counter to US proposals "totally unacceptable".
According to Iranian media, the Islamic Republic's proposals include an end to the conflict on all fronts - referencing the Israeli attacks on Lebanon, where Tehran's allies Hezbollah are situated, the BBC reports.
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President Trump issues a fresh warning on Iran as peace talks continue on
|TRUTH SOCIAL / DONALD TRUMP
Terms of the proposal also include a stop to the US naval blockade of Iran's ports and a guarantee of no further attacks on the Islamic Republic.
Mr Trump, returning from Beijing after last week's state visit to the Chinese capital, spoke to reports on Air Force One, saying the US and Iran had agreed Tehran would not be allowed to have a nuclear weapon and must reopen the critical shipping lane, the Strait of Hormuz.
On March 2, Iran declared the closure of the Strait of Hormuz, meaning commercial vessels could not pass through the waterway safely.
As a consequence, oil barrel prices have experienced price shocks, with petrol and diesel in the UK costs going up as a knock-on effect.
In peace time, roughly 20 per cent of the world's oil passes through the strait.
A reporter asked the US President if a 20-year suspension of Iran's nuclear programme was not enough.
He said in response: "Twenty years is enough, but the level of guarantee from them, in other words it's got to be a real 20 years."
In April, US media reported that during talks in Islamabad, Vice President JD Vance had rejected Iran's terms to halt uranium enrichment for five years, countering with a minimum of a 20-year ban instead.
During his first term, Mr Trump withdrew from the 2015 nuclear agreement brokered by the Obama administration, pointing to so-called sunset clauses which would have allowed certain restrictions on Iran to life over time.
Israel has not yet responded to President Trump's remarks.
Prime Minister Benjamin Netanyahu has said Iran's stockpile of enriched uranium must be "taken out" before the conflict can be considered over.
The Israeli Prime Minister was a fierce opponent of the 2015 deal, arguing that its sunset clauses left open the possibility of Iran eventually acquiring nuclear weapons and continuing to pose a significant threat to Israel.