Regime Change Iran

This is the most interesting news item of the day from Iran:

One of the bodyguards of Iran’s President Mahmoud Ahmadinejad was killed and another wounded when an attempt to ambush the presidential motorcade was thwarted in the southeastern province of Sistan and Baluchestan, according to a semi-official newspaper and local residents.

I've previously posted about the political change within Iran. Clearly a crisis is building. The folks at RGI believes this isn't a regional uprising:

However, for months now there have been rumors that the Rafsanjani and Khatami factions may attempt to have Ahamdinejad assassinated in hopes of obtaining a "grand bargain" with the international community which leaves the regime in place while they continue their secret nuclear program. Ahmadinehad has been threatening many in the Rafsanjani and Khatami factions with arrest under corruption charges.

From Roger L Simon

(Michael Ledeen, who has contacts within the Iranian freedom movement, informs me these "bandits" were also, like Ahmadinejad, messianic believers in the 12th imam - hence it's an inside job. Who knows?)

My question is what is our involvement in this. Notice the region's proximity to Afghanistan and Pakistan. If not involved, what else short of sanctioned assassination, which i oppose, should we do to destabilize Iran from within. We are not in a position to mount an conventional confrontation with Iran at this time.