Why Turkey has decided to approach the Iranian regime to jointly fight against the Kurdish people?

Why Turkey has decided to approach the Iranian regime to jointly fight against the Kurdish people?
Turkey pm went to Iran for two different goals one could with Iran along the war against the Kurdish movement and to stop the road that can get weapons to the PKK, the Kurdistan Workers Party.
Turkish 2 goals so as to be able to separate between Russia and Iran that Turkey wants to separate Iran from Russia.
Turkey has gone to European countries for help against the Kurdish people and Germany have said to Turkey, it is best that Turkey try to discuss with Iran because Iran has the same problems with the Kurds and Iran and Turkey can cooperate together and wage war against the Kurdish people