Russia has just delivered to Iraq's al-Muthanna Air Base the first five of a total of twelve Sukhoi Su-25 "Frogfoot" close air support jet aircraft. Within a few days these aircraft will provide much needed support for Iraqi and Iranian ground troops in Iraq engaged in combat against the forces of the newly declared Islamic State (formerly ISIS). It is apparent that Russia will also be providing the pilots to fly these aircraft on combat missions in Iraq. This is obvious because Iraq has no pilots trained to fly this type of Russian aircraft, and haven't had any in over a dozen years. The Su-25 Frogfoot is the Russian version of the US-made A-10 "Warthog."
2 July 2014: Yesterday the five Russian Su-25 Frogfoot close air support aircraft at al-Muthana Air Base were joined by a total of seven Iranian Su-25 Frogfoot aircraft. This constitutes the total of 12 aircraft promised to be deployed to Iraq by Russia.
The Iranian Su-25s (3 each Su-25UBKM and 4 each Su-25KM variants) were seen in a video released by the Iraqi government in Baghdad. Analysis of the video revealed that these are aircraft known by their serial numbers to be within the inventory of the Iranian Revolutionary Guards Corps Air Force. Ten IRGC pilots were deployed with these aircraft, and they will likely provide 4 Iraqi pilots with (no pun intended) a crash course in their effective combat operation. So, now we have Russian, Iranian IRGC and US aircraft operating side-by-side in Iraq.