April 21, 2016 10:43 AM EDT

The U.S. continues to have “serious concerns” about Iran’s behavior even after the watershed nuclear deal last year, President Barack Obama said on Thursday during meeting hosted by Tehran’s arch-rival Saudi Arabia.

While the agreement signed on July 14 had helped “cut off every single one of Iran’s pathways to a nuclear weapon,” illegal Iranian arms shipments, ballistic missile tests, and “destabilizing acts” were a continued worry for the U.S. and its allies, the president said.

Obama was speaking in Saudi Arabia where he was conducting talks with the Gulf states on how to coordinate better on conflicts across the region…

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