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CAIRO — When Syria's president visited Iran late last year, he received a heroes' medal and spoke about unbreakable bonds in a ceremony broadcast on national television.

Now, a nervous leadership in Iran has imposed a media blackout on Bashar Assad's struggle against a swelling Syrian uprising and Tehran faces the unsettling prospect of losing its most stalwart ally in the region.

The Islamic Republic managed to choke off its homegrown "Green Revolution" after the disputed June 2009 presidential election. But now it is being dragged into the uprisings sweeping across the Middle East and stirring unrest in Syria, and unfriendly neighbor Bahrain.