problem with supplying high tech military equipment is that these systems need to be integrated and the personnel needs to be trained to operate them to their fullest. Seems like Iran has only requested China-Russia assistance after the 12 day war, and I fear that it's not enough time to master these equipment. The other option is to have China-Russian personnel operating them, but I highly doubt China-Russia will risk it.
Pakistan's recent success with their J-10CE was because they have been training on J-10c for months, if not years, in China, before they were even delivered to Pakistan.