World powers will hold crisis talks in Austria on Friday, trying to salvage the troubled Iran nuclear accord. US President Donald Trump announced two months ago that he was abandoning the agreement. Our correspondent Kate Parkinson reports from Vienna.

It was here, in the Austrian capital, in 2015 that the Iranian nuclear deal was signed, ending a 12-year diplomatic stand-off. There were smiles all round as Iran and ministers from six nations, led by the United States, announced that Tehran had agreed to curb its nuclear program in exchange for the lifting of some international sanctions. But in May, US President Donald Trump withdrew from the deal, and announced he'd be reimposing high-level sanctions on Iran. Those sanctions are due to kick in next month which is why Iranian President Hassan Rouhani is in Europe trying to rally support for the accord among its remaining signatories - China, France, Germany, Britain and Russia. Ahead of Friday's talks, Chinese Foreign Minister Wang Yi reaffirmed Beijing's desire to uphold the deal.

WANG YI CHINESE FOREIGN MINISTER "If this treaty can't be upheld - then this doesn't just hurt the interests of Iran, it also damages the peace in the Middle East and the credibility of the international world order. That's why we need to think about how to ensure the survival of the deal."

European leaders and Russia also say they are committed to the deal.

KATE PARKINSON VIENNA "But despite political backing for the deal, the business world is wavering. Some foreign firms have already said they're going to stop doing business in Iran in light of the looming imposition of sanctions. Tehran says it's willing to stick to the terms of the deal but in return, it will be wanting a concrete guarantee that there's a plan in place to create a sanction proof channel to keep money flowing into Iran. Kate Parkinson, CGTN, Vienna."