It's in production already, including the engines. Additionally I suspect that "up to 3 regiments" really means 2-3 regiments. They might approve a purchase of an additional 24 fighters. The current Russian airbases format, still retains the regimental VVS structure, just puts it into more manageable taskforces. I seriously doubt it will be mixed. Russia agrees to sell this aircraft because we need (or rather want) money. It's that simple.
Perhaps you're right. But it matters little, cause a batch/squadron/regiment of 12,18 or 24 Su-35S will most likely be station at an airbase along side with exsisting Su-27SM regiments.
Which again would mean those will merge into each other when doing exercise, patrols and god forbid on real missions..
Feanor do you think Russia are willing to export an Su-35 with the 117-S engines, NIIP N-035 Irbis radar, L175M Khibiny-M self-defense electronic countermeasures & electronic warfare system and all the latest software to other countries?
I don't think it could be done in the next 2-4 years, but perhaps later on when the Pak-Fa matures more.
Thanks