Iranian President Hassan Rouhani berated Muslim nations for their involvement in the Syrian conflict on Sunday, saying the conflict only benefited Israel.

Rouhani also said the Islamic State group and other armed groups are defaming Islam by resorting to barbaric acts and that has led to Muslim states forgetting their common enemy: Israel.

“Does the weakening of Syria benefit its Muslim neighbors? Does the destruction of Syria lead to the strengthening of Turkey, Jordan, Saudi Arabia, Qatar, United Arab Emirates or other countries? Who is pleased by Syria’s destruction other than Israel?” he asked.

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Addressing a conference in Tehran, Rouhani suggested that destroying Syria wouldn’t strengthen those governments in the region which support the anti-Assad rebels.

For most of the speech, the Iranian president accused arch-rival Saudi Arabia of promoting poverty and terrorism by continuing to bomb Yemeni rebels and supporting armed rebels fighting to topple Syrian President Bashar Assad in Syria.

Iran is one of Assad’s main allies and has provided his government with military and political backing for years.

“How many bombs and missiles have you purchased from the US in the past year,” Rouhani asked in an apparent reference to Saudi Arabia. “If you had distributed the same money among poor Muslims, none of them would have gone to bed hungry.”

Rouhani, a moderate politician, said a Saudi-led coalition that has been bombing Yemen since March has prompted a humanitarian crisis and greater poverty in Yemen, saying these were among the main causes behind the spread of extremism in the region.

Rouhani’s comments highlight the struggle for regional supremacy between Shiite powerhouse Iran and the Sunni kingdom of Saudi Arabia that has played out in conflicts in Bahrain, Lebanon, Syria and Yemen, where Saudi Arabia is leading an Arab military intervention against Shiite rebels who are backed by Iran.

The Yemen conflict pits President Abed Rabbo Mansour Hadi, a US ally, against the Iranian-backed Shiite Houthis — who control the capital, Sanaa — and military units loyal to ex-president Ali Abdullah Saleh.