Iran's currency virtually collapsed last week, and the public protests that followed in Tehran stirred memories of the massive anti-regime protests of 2009. This has caused excited speculation in the United States and its allies about the imminent fall of President Mahmoud Ahmadinejad, the abandonment of Iran's uranium enrichment programme, or even the end of the whole Islamic regime. Don't hold your breath.
Ahmadinejad blamed the currency crisis on the foreign sanctions that are crippling Iran's trade, of course. His critics at home just blamed him: "The smaller part of the problem relates to sanctions while 80 per cent of the problem is rooted in the Government's mistaken policies," said Ali Larijani, Speaker of the Iranian Parliament. But he would say that, wouldn't he?
It's true that Ahmadinejad has used the country's large oil revenues to paper over serious mistakes in running Iran's economy, but the current crisis was caused by a steep fall in those revenues - which is directly due to the sanctions.
Four rounds of United Nations-backed trade sanctions, ostensibly meant to stop Iran from developing nuclear weapons, had already cut the country's oil exports from 2.5 million barrels a day to 1.5 million b/d by early this year.
In July came new European Union sanctions banning oil imports from Iran entirely. Since Europe was taking one-fifth of Iran's remaining oil exports, that was enough to send the currency into free-fall.