So, the translation here is that Erdogan and Zelensky are going to meet on 3/Feb. The role of Turkey we might have mentioned before. They are a Black Sea power. They control the straights (The Montreux Convention) https://en.wikipedia.org/wiki/Montreux_Convention_Regarding_the_Regime_of_the_Straits
Which because it is under Turkey's control means they can say no to Russia bringing in its amphibious ships to the Black Sea from the Med. Also, Turkey was a huge help to Azerbaijan (UAVs for example) in the recent war with Armenia. So, basically, Erdogan is an evil thug but right now he can be a useful evil thug.