Bryan has it at Hot Air. I’m going to have to go with Ace (and several others) on this and say: I’ll believe it when I hear it from Putin. The article is in the Asia Times and seems more biased than usual:

The barely reported highlight of Russian President Vladimir Putin’s visit to Tehran for the Caspian Sea summit last week was a key face-to-face meeting with Supreme Leader Ayatollah Ali Khamenei.

A high-level diplomatic source in Tehran tells Asia Times Online that essentially Putin and the Supreme Leader have agreed on a plan to nullify the George W Bush administration’s relentless drive towards launching a preemptive attack, perhaps a tactical nuclear strike, against Iran. An American attack on Iran will be viewed by Moscow as an attack on Russia.

Bryan points out that there’s no actual quote from Putin. What would be in this for Putin and Russia? Doesn’t seem like a smart move.