Beijing [China], March 15: Almost a decade since world powers sealed a historic deal to limit the Iranian nuclear programme, this is a crunch moment for Iran and the international community.
The country is now closer than ever to being able to make a nuclear bomb.
And the agreement - designed to prevent Iran developing a nuclear weapon - expires later this year.
"It's a real fork in the road moment," says Dr Sanam Vakil of the London-based think tank Chatham House. "Without meaningful and successful diplomacy we could see Iran weaponise or we could see a military strike against the Islamic Republic."
The deal, painstakingly negotiated over nearly two years under Barack Obama's presidency, imposed restrictions on Iran's nuclear activities in return for relief from sanctions that crippled the country's economy.
But after Donald Trump pulled out of the agreement in 2018 during his first presidency and reinstated US sanctions, Iran gradually stopped complying with its commitments.
It has accelerated its enrichment of uranium - used to make reactor fuel but also potentially nuclear bombs - to close to weapons-grade.
Experts say it would now take Iran less than a week to enrich enough material to make a single nuclear weapon.
Hence a flurry of urgent diplomatic activity by the US and the five other parties to the deal - the UK, China, France, Germany and Russia.
A closed-door meeting of the UN Security Council discussed Iran's nuclear programme on Wednesday.
And China is hosting talks with Iran and Russia on Friday in search of a "diplomatic" resolution.
"In the current situation, we believe that all parties should maintain calm and restraint to avoid escalating the Iran nuclear situation, or even walking towards confrontation and conflict," Chinese foreign ministry spokeswoman Mao Ning said this week.
On Wednesday, a letter from President Trump was delivered in Tehran by a senior diplomat from the United Arab Emirates.
The contents have not been made public.
But President Trump, after imposing new sanctions on Iran as part of a "maximum pressure" campaign, last week issued a televised ultimatum to Iran: make a deal or else.
"I've written them a letter saying, 'I hope you're going to negotiate because if we have to go in militarily, it's going to be a terrible thing,'" he said.
Iran's Supreme Leader, Ayatollah Ali Khamenei, appeared to reject the idea of talks with a "bullying" US.
So too - publicly - has President Masoud Pezeshkian, who had previously supported a resurrection of the nuclear deal, in return for an end to sanctions.
But the country has been sending out mixed messages.
"There are camps inside the country that favour negotiations," says Dr Vakil. "And there are camps that see weaponisation as the best opportunity for Iran to manage its security."
Trust in the Trump administration is in very short supply.
"They have seen his erratic, very bullying approach to [Ukraine's President Volodymyr] Zelensky. And his outlandish proposals on Gaza and they don't want to be put in that position," Dr Vakil adds.
Iran hates the humiliation of having a gun held to its head. But it is currently vulnerable - weakened militarily by Israeli air strikes last year, which are believed to have destroyed most of the air defences protecting its nuclear programme.
Israel has long wanted to take the facilities out.
Iranian authorities continue to insist the country's nuclear programme is for peaceful purposes.
But concern in the international community is becoming increasingly acute.
Source: Fijian Broadcasting Corporation
