Iran told the United States on Tuesday that it will keep “all options on table” if President Donald Trump designates its elite Revolutionary Guards (IRGC) as a terrorist organization.

President Donald Trump is expected to announce soon that he will decertify the landmark international deal to curb Iran’s nuclear program, a senior administration official said on Thursday, in a step that potentially could cause the 2015 accord to unravel.

Turkey, Iran and Iraq will jointly decide on closing the flow of oil from northern Iraq, Turkish President Tayyip Erdogan was quoted as saying on Thursday, a retaliatory move after the Kurdish region voted for independence.

Iranian Foreign Minister Mohammad Javad Zarif made an appeal for greater regional cooperation on Tuesday after returning to Tehran from a two-day visit to Oman and Qatar.

Turkish President Tayyip Erdogan arrived in Tehran on Wednesday to discuss a possible joint response against a Kurdish vote in favour of secession in Iraq, a result with both Turkey and Iran fiercely oppose.

U.S. Defence Secretary Jim Mattis said on Tuesday Iran was fundamentally in compliance with its nuclear deal, as President Donald Trump's administration weighs whether the 2015 deal serves U.S. security interests.

The ruler of Oman received Iran’s foreign minister on Monday, the state news agency ONA reported, in a rare official appearance for the long-time leader.

Iran deployed a dozen tanks supported by artillery at its border with Iraq’s autonomous Kurdish region on Monday, a Kurdish official said, adding that the move was a dangerous escalation in the crisis triggered by Iraqi Kurdistan’s independence vote.

Iran's foreign minister traveled to Oman for a daylong visit Monday with officials in the sultanate, which has served as a crucial link between Iran and the U.S. in the past.

Iranian and Iraqi central government forces are to hold joint military exercises near their borders, Iran’s state television reported on Saturday, as part of Tehran’s effort to support Baghdad after the Kurdish independence referendum.

Iraq plans to take control of the borders of its autonomous Kurdistan region "in coordination" with Iran and Turkey, the Iraqi Defence Ministry said on Friday.

The top U.S. military officer said on Tuesday Iran was complying with the pact curbing its nuclear program and warned that any American decision to walk away from it would make other nations less likely to enter into agreements with the United States.

The ambassadors to Washington from Britain, France, Germany and the European Union all strongly backed the international nuclear agreement with Iran on Monday, as long as Tehran continues to comply with the pact.

Bpifrance, the country's state investment bank, will finance investment projects of French companies in Iran from 2018, granting up to 500 million euros ($598 million) in annual credits, its CEO said in a newspaper interview on Sunday.

Iran halted flights to and from Kurdish regions in northern Iraq on Sunday in retaliation to a plan by the autonomous Kurdistan Regional Government (KRG) to hold a referendum on independence. It also started wargames at the Kurdish border.

Turkey, Iran and Iraq have agreed to consider counter-measures against Kurdish northern Iraq over a planned independence referendum, Turkey’s foreign ministry said on Thursday.

Iran will strengthen its missile capabilities and not seek any country’s permission, President Hassan Rouhani said on Friday rejecting demands from U.S. President Donald Trump.

The United Arab Emirates said on Friday it considers that Iran violates both the “letter and spirit” of the 2015 nuclear deal agreed between the Islamic Republic and world powers.

Bahraini Foreign Minister Khalid Al-Khalifa criticized Iranian President Sheikh Hassan Rouhani’s address delivered at the UN General Assembly, stating that what Rouhani said about Bahrain was unacceptable and would see a response.

Iran’s President Hassan Rouhani said that the crises in Syria, Yemen and Bahrain do not have military solutions and can only be resolved through cessation of hostilities, and the acceptance of the will and wishes of the populaces.