Since the Arab Spring began in 2011, Iran has declared support for the uprisings in Egypt, Libya and Bahrain.
But in Syria, hundreds of thousands have been killed and millions displaced, yet Iran continues to support President Bashar al-Assad.
Iranian Vice President Masoumeh Ebtekar says the "people of Syria" have the "right to decide", and blames "foreign powers arming terrorist groups" in the war-torn country.
"This is something that has to be addressed," says Ebtekar. "I think the people of Syria should be supported in terms of their struggle against terrorism."
In this week's Headliner, Mehdi Hasan talks to the Iranian vice president and head of Iran's Environmental Protection Organisation.
For an extended section of this interview, click here.
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Source: Al Jazeera News