Iranian Foreign Minister Mohammad Javad Zarif said, "It was the people who made the Islamic Republic of Iran so powerful."
The protests in Iran may have blown up the president's dream of shredding that country's nuclear deal.
Saudi Crown Prince Mohammed bin Salman is a rising star in the Middle East, but his hands are tied.
More than 20 people died in a week of protests in Iran, and Moscow's support for the regime's "nefarious designs" is a problem, the White House's top security adviser said.
Iran has blamed domestic unrest on foreign interference ever since the CIA helped foment a coup in 1953.
French President Emmanuel Macron said the U.S., Israel and Saudi Arabia have been trying to revive the "Axis of Evil" in their stance toward Iran.
Moscow is rushing to the defense of its ally, suggesting that the unrest in Iran is no worse than clashes in the U.S. in recent years.
In 1953, the CIA backed a coup against democratically elected Iranian Prime Minister Mohammad Mossadegh, restoring absolute power to the Shah.
In 2017, Trump was sued on First Amendment grounds over blocking his critics online.
The vice president's message to demonstrators was clear.