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In page Iran–Saudi Arabia relations:

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After the Iranian Revolution, relations deteriorated considerably after Iran accused Saudi Arabia of being an agent of the US in the Persian Gulf region, representing US interests rather than Islam. Saudi Arabia is concerned by Iran's consistent desire to export its revolution across the board to expand its influence within the Persian Gulf region—notably in post-Saddam Iraq, the Levant and within further south in addition to Iran's controversial, much debated nuclear program.[1]