what is Iran policy interest in Lebanon and how Shi’ite community works as Iran’s umbrella in Lebanon.

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Topic: Iranian policy in Lebanon, after the Islamic Revolution 1979
Research question: what is Iran policy interest in Lebanon and how Shi’ite community works as Iran’s umbrella in Lebanon. What are some of Iran’s foreign policy instruments using Hezbollah as one of the most important interlocutor in Lebanon, to challenge countries as U.S and Israel.