Iran will hold talks in Istanbul on Friday with European parties to their now-moribund 2015 nuclear deal, two European and an Iranian diplomatic source said on Tuesday,

A fourth round of talks between the US and Iran on Iran’s nuclear program have begun in Oman, according to Iranian state media, with the two sides aiming to overcome divisions that could scupper the tentative negotiations.

Tehran called Sunday’s meeting “difficult but useful” as the two sides clash over future of Iran’s uranium enrichment.

Saudi Arabia fully supports the U.S.-Iran nuclear talks and hopes for positive results, the kingdom's foreign minister Prince Faisal bin Farhan Al-Saud said on Wednesday.

The talks with the UK, France and Germany would be held in Istanbul on Friday, ministry spokesman Esmaeil Baghaei said, quoted by state news agency IRNA. French diplomatic sources gave the same information, but there was still no word from Berlin or London on the meeting which was originally slated for earlier this month but postponed.

Diplomatic efforts between Washington and Tehran have stalled amid rising tensions and new sanctions from U.S. President Trump.

President Trump cherishes big, out-of-the-box deals. As he tours the region, Trump should think beyond Iran’s nuclear issue and work to achieve the denuclearization of the entire Middle East.

The Trump administration sanctioned nearly two dozen firms operating in Iran’s illicit international oil trade, as President Donald Trump delivered remarks in the Middle East – tempting the Islamic Republic with a "much brighter future" should it come to a nuclear agreement with the United States.