The erosion of economic relations between Turkey and Iran could have repercussions on political relations and the often perceived regional rivalry between the two countries. If these countries maintain and extend the common perception of the threat and attempt to stem geopolitical divergences through institutional mechanisms, their relations could be maintained in the short term against the economic downturn, but both countries will struggle to preserve their trade from decline. Both sides stressed their strong commitment to Syria`s sovereignty, independence, unity and territorial integrity, in accordance with all the agreements reached under the Astana format, and reaffirmed their belief that the Syrian conflict could be resolved through a political process in accordance with UN Security Council Resolution 2254. 112 Ceyhun Can Ozcan, `www.iramcenter.org/iran-ve-turkiye-turizm-iliskileri/` On April 22, 1926, the first “friendship treaty” between Iran and Turkey was signed in Tehran. The fundamental principles were friendship, neutrality and non-aggressiveness. The agreement also included possible joint actions with groups in the territories of both countries that would attempt to disrupt peace and security, or attempt to change the government of one of the countries. This policy indirectly addressed the internal problems that the two countries had with their Kurdish minorities. 104 `Bey-kel`ilik M`aviri: `ran ve Turkkiye ticareti Amerikan sask`s`n`atlatmas`yla artacak` Milliyet, 26 February 2018, www.milliyet.com.tr/buyukelcilik-musaviri-iran-ve-turkiye-izmir-yerelhaber-2621411/ (called 5 February 2019). Some of the “Iranian” companies registered until 2003 in Turkish sources were set up by Iranian exiles who fled to Turkey for various reasons to guarantee residence permits in the country. The automatic right to residence permits was abolished in June 2003, resulting in a significant decrease in the number of Iranian companies.
After the tightening of sanctions, many Iranians transferred their operations to Turkey. Despite the increase in the number of companies, their investments have been considerably low. Most Iranian companies are based in Istanbul and are mainly involved in wholesale or retail businesses. Despite media reports of imminent Iranian investment in Turkey, they have not been made. Jenkins, Occasional Allies, Enduring Rivals…, p.63-65. Iran`s first vice-president Mohammad-Reza Rahimi announced in October 2012 that the speed of trade between Iran and Turkey had accelerated and that the target of $30 billion a year was close to both. He added that the growing trade relations between Tehran and Ankara indicate the willingness of the two countries to strengthen their mutual relations. [Citation required] On 29 April 2019, Turkey and Iran wanted to end their intention to strengthen their transport cooperation, as reported by the daily Enthuus Hurriyet.  In May 2010, Turkish Prime Minister Recep Tayyip Erdogan, in coordination with Brazilian President Lula da Silva, made an unscheduled trip to Tehran to conclude an agreement to outsource Iranian uranium enrichment to his country to avoid further sanctions against Iran.
 In supporting Iran after the agreement, he referred the matter to the international community. “There are currently no nuclear weapons in Iran, but Israel, which is also in our region, has nuclear weapons. Turkey is on the sidelines. What did the international community say against Israel? Is it the superiority of the law or the law of the superiors?  44 Turkish and Iranian attempts to strengthen cooperation on gas transactions have failed. In July 2007, Iran and Turkey signed a Memorandum of Understanding which assumed that the Turkish state-owned oil company TPAO would develop Phases 22, 23 and 24 in the South Pars gas field.