Turkey is an Islamic enemy nation. If thug Erdogen is ok with thug pootz then it’s just TFB what anybody else wants.
Turkey is also an ally and a fellow NATO nation, you haven’t explained why you think it is normal for enemy nations to be allowed their own president’s fighters jets if he seeks to fly in for an audience.
According to the article, “Russia’s president has been delaying trip to Ankara for almost two years because of his extraordinary requests”
“One person familiar with the talks said Turkey isn’t likely to shut NATO systems down to accommodate the Russian request. “