Iran calls Assad's overthrow a red line

A senior aide to Iranian supreme leader Ayatollah Ali Khameni has warned that the overthrow of Bashar al-Assad would be a red line for Iran.

"If the Syrian President Bashar al-Assad is toppled, the line of
resistance in the face of Israel will be broken," Ali Akbar Velayati,
who is seen as a potential contender in Iran's June presidential
election, said in an interview broadcast on Sunday.