National Security Adviser John Bolton on Monday lashed out at the Iranian regime during its 40th anniversary of the Islamic Republic, lambasting the Ayatollahs for "40 years of failure", and predicting: "I don't think you'll have many more to enjoy".
The 10-day period from the return of Imam Khomeini until the revolution's victory is celebrated annually in Iran, and is known as the Ten-Day Fajr (Dawn).
Hundreds of thousands of Iranians marched and some burned U.S. flags to mark the revolution as Tehran showed off ballistic missiles in defiance of USA efforts to curb its military power.
That upheaval ended centuries of monarchy in Iran and led to the formation of the Islamic Republic of Iran with Supreme Leader Ayatollah Khomeini at its head.
The years since have been marked with domestic struggles between reformist and conservative politics, and global disputes over Iran's nuclear development.
The Syrian Foreign Ministry has repeatedly denounced the Israeli attacks on Syria as aiming at prolonging the war in the country which has lasted for more than seven years.
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The Iranian people "will not stop saying "Death to America" as long as the USA acts malicious" toward Iran, Khamenei said, referring to Trump's State of the Union address in which the American president, among other things, said: "We will not avert our eyes from a regime that chants death to America".
"Iran will continue to expand its military might and missile program", Iranian President Hassan Rouhani told the crowd who gathered in Azadi (Freedom) Square.
Iran displayed its ballistic missile capabilities during a parade, including the Zolfaqar, a ground-to-ground missile with a 700 km (435 miles) range and the Qiam, with a range of 800 km, according to Tasnim news agency. He said, "The United States does not have the courage to shoot a single bullet at us".
Since the revolution, Iran has become more divided.
Israeli Prime Minister Benjamin Netanyahu dismissed the threat.
The remarks came a day after Trump tweeted about 40 years of "corruption, repression and terror", reacting to the 40th anniversary of Iran's Islamic Revolution, which he claimed was followed by "the regime in Iran producing only 40 years of failure". "They should take this into account", Netanyahu said in a warning to his country's archfoe. Today, the United States, its Arab allies and Israel are trying to counter Tehran's growing influence in the Middle East, where it has proxies in Syria, Lebanon and Yemen.