This book explores the determinants of Iran's foreign policy towards its GCC neighboring countries. She considers the dimensions of internal and external, as well as identity and nationalism. AL-Saad aims to identify the strategic importance of Iran's nuclear program, the agreement with the major powers in 2015, and its impact on Iran's foreign policy. She then addresses possible future scenarios and implications of Iran's foreign policy towards the GCC region, upon the US withdrawal from the Iranian nuclear deal.