True, but it also costs money and takes time. And bears risk that success is not with the first iteration. Currently Tu-204/214 has all Russian components and MS-21 is likely to have unless somebody took lots of bribes to do otherwise.
If they want to use them domestically they will need domestic versions...
SSJ100 will be gradually localized but unlikely 100%.
I am sure the Russian military can find a use for such an aircraft and they can pay to Russianise it.
Of course keep in mind the costs to develop Russian equivalents is money spent investing in something that can be applied to Russian aircraft across the board, so not only is it money spent within the Russian economy on a Russian company to allow it to replace foreign companies in the local and international market, it also improves the level Russian companies can work and compete at internationally and domestically.
One more negative factor is that now US is imposing new sanctions against Iran. This effectively blocks Iranian funds on western accounts. So this 100bln USD unlikely returns home.
They should withdraw them all immediately... why buy products from such a criminal organisation?
I can only think Stockholm syndrome.
Why not do both by selling the western equipped Russian aircraft to Iran right now and using the immediate profits fund R/D for domestic technologies?
What profits... the western companies making the western components get the most profit from such sales.... it was the same with the Indian Su-30MKIs...
Thales made out very well on those deals....
It doesn't seem it will get delayed, it already passed all manufacturer's tests and is now undergoing certification, it is unlikely they will stumble into serious problems at this stage.
It is going to be very widely used on Russian engines... both new and existing.
It will be used on new Il-276 (only two per aircraft) and also Il-476 (4 per aircraft).
An uprated model could even be used on the upgraded and updated Il-106... which might end up being called Il-676 perhaps...
More amusing is if the US cancels the deal completely and puts Iran under full US sanctions again... that means Airbus but not Boeing...