The oil-rich Sunni kingdom views Shiite Iran as a regional rival that is perhaps even more menacing than Israel.
That was clear in a string of columns this week published in Saudi state-linked media, which is widely seen as reflecting official views and mainstream thought in the kingdom, and which voiced skepticism of President Barack Obama's efforts to broker a landmark nuclear agreement with Tehran.
Today, US Secretary of State John Kerry was in the Saudi capital to ease Gulf concerns about the negotiations with Iran, which are aimed at reaching a framework agreement this month and a final deal later this year.
Kerry is meeting with the foreign ministers of the Sunni-ruled Gulf states and the new Saudi monarch King Salman.
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Like Israel, Saudi Arabia has long viewed Iran as an expansionist power that seeks to dominate the region through local proxies, including Lebanon's Hezbollah, Palestinian armed groups in the Gaza Strip and Shiite militias in Iraq.
In a column published in Asharq al-Awsat, a daily owned by King Salman's family, Abdulrahman al-Rashed wrote "Iran's fingerprints are everywhere."
"Iran is currently in an offensive state, the likes of which we have not seen in modern history," he wrote.
Netanyahu said as much to Congress, telling lawmakers that Iran is "gobbling up" nations in its "march of conquest, subjugation and terror."
Saudi Arabia is part of the US-led coalition striking the Islamic State group, awkwardly putting it on the same side as Iran, which is battling the extremists through its allied Shiite militias in Iraq and by supporting Assad. The kingdom, like the US, has refused to coordinate its efforts with Tehran.