It should be noted that while there is no official confirmation of the specified information from Brussels from authorized persons. Therefore, believe or disbelieve this information, let everyone decide for himself.
It should be added that the codification is used by NATO to symbolize and classify naval, aviation, missile and other military equipmentwhich the probable adversary produces. Roughly speaking, this is a nickname assigned for easier perception.
By the way, currently in Russia, the contract for the supply of the Ministry of Defense of 76 Su-57 units is in full swing (they will be equipped with three air regiments). Serial production began in July 2019. The first batch of these Su-57s should be available to the Ministry of Defense by the end of 2019.