The Kremlin has not confirmed Putin's visit to Turkey. Vlad's paranoia may cause a change in plans.
Allegedly, Putin is going to discuss an extension of the Black Sea Grain Deal, a prisoner swap, and options for ending the war. Erdogan has already met with Zelensky. So, in general, I think Putin should be left alone while he is there if he goes. I don't mind giving the enemy safe passage to negotiate.
Most likely Vlad does not want to go- for a number of survival reasons- but the Chinese are putting pressure on him to meet with the various persons/countries that are offering to negotiate settlement of issues. The west/Americans know that Erdogan is a snake but they are willing to let him look ballsy and get credit for some things in return for his approval of Sweden entering Nato.
I would rather see Putin meeting with Erdogan the Snake than with Macron.