It is beyond doubt that Turkey lacks a lot of modern systems to fill the gaps. Getting technology, and not just black box gear, is becoming more and more important. So, I don't really worry where Turkey will get the rest from.
Weapons “Made in Russia”: NATO Summit Tells Member States to Get Rid of Russian Weapons
There is nothing new in this. It’s a time-worn topic. But whatever is said and promised, the allies continue to use Russian weapons. Some of them even make new purchases. It was assumed that former Warsaw Pact members, such as Poland, Bulgaria, Romania, Hungary, the Czech Republic and Slovakia, would get rid of them upon entering NATO (1999-2004). It turned out differently.There are always ways to get around the rules. Some NATO countries, such as Poland and the Czech Republic, manage to find loopholes. They modernize Russia weapons giving them new names. This will enable them to say they comply with the rules while continuing to use them. Poland believes that buying a license from Russia to produce the Mig-29 makes it a Polish, not Russian, plane. The same applies to the Igla MANPAD renamed Grom-M to be later improved into what became known as the Piorun, with a new seeker and rocket motor. The Grom and Piorun missiles are integrated into the Poprad weapons station. It is exported as a Polish weapon. 23 mm ZU 23-2 GRAU 2А13 and 23-4 Shilka self-propelled anti-aircraft artillery guns have been upgraded with electric drives, fire-control systems (FCS), and detection systems and MANPADS to become Polish 23-2TG and 23-4МР Biała systems. The list can go on.