Seyed Hossein Mousavian
The JCPOA was an international agreement between Iran and world powers endorsed by the U.N. Security Council in Resolution 2231. But while the Iranians fully implemented the deal, the United States withdrew from it under the Trump administration and the European Union subsequently failed to fulfill its responsibilities under the agreement. The upshot of the U.S. withdrawal and European complacency was a revival of sanctions at a pace and intensity unprecedented over the past 40 years. This has emboldened Iran’s long-debated strategy of adopting a “Look East” foreign policy, as the JCPOA experience convinced the Iranians that no matter how much goodwill is demonstrated, the West is both unreliable and untrustworthy.
https://thediplomat.com/2020/10/irans-new-doctrine-pivot-to-the-east/