Defend what and Against who. If it is EU or Current Russia yes but you have to be ready the enemy will reach some of your cities and inflect harm. And if it is these same powers backed by the 2 big boys you should have at least thousands of TB's and Anka's and hundreds of fighter. Some think about Allies and Nato and Assumptions just be ready for everything then enjoy the thoughts of friends with good will. And what ever the burden is it will be better than history repeating and enemies reaching the homeland from all sides.You must think of the doctrine applied here.
The KIZILELMA and Anka's are not alone,they are just a part of our defence doctrine.
TFX,F-16,Anka III,KIZILELMA,TB2,Boeing 737 AEW&C ,Hisar SIPER Air Defence Systems,Tf-2000 etc all together defend Turkish territory.
You only need what is necesarry to defend your territory,to much is a just a burden.