Turkey could mine the striates. Intelligent mines can be set to go off on only certain ships. Why Turkey would want to further annoy Russia is beyond me.
Incidentally, Russia has been carrying on a clandestine war inside Turkey for years. They bring in a hit man, then kill a few Islamists who are using Turkey as a base to target Russian interests. To my knowledge Turkey has never caught a hit man. It’s likely the hitter is out of the country by the time the body is discovered. Very efficient, the FSB.
Because they have long standing ties to the Crimean Tartars and are also directly threatened by Russia’s aggressiveness in the Black Sea and Caucasus.
Do you have any sources on that?