Will the Iranian protests turn into revolution?
It was an option back then:  >>/54531/ tho as they noted they did not really know how to do that. Since then quite some revolutions were nudged to succeed, I bet it was elevated to actual foreign policy instrument.
Listening Wyatt of DPA summary, he talks about Iran too:
https://yewtu.be/watch?v=GfDRMdHk5YE
https://youtube.com/watch?v=GfDRMdHk5YE
Relevant part starts about 20:00 mins.

It does seem like countries where Russia had interest fall.
Syria, Venezuela, and now Iran?
Tho I think we should not overestimate the problems this could cause to Russia. It's just their area of operation gets reduced. But another way of looking it: perhaps Russia had no resources to maintain its presence and influence in these places, so US is able to make these moves.

 >>/55005/
Somewhere they surely are. Here's two.