Passport confusion

Hello,

I have an issue and would like to know if someone here has some advice or knowledge regarding my situation.

So I have a Belgian passport & both Russian passports. I want to travel to Russia soon, probably through Turkey, and then to an airport in Russia.

Now the issue is that on my Russian passports I have a different last name than on my Belgian ID and passport (the Belgian one has the right one tho) I don’t know why or how they’ve changed it.

So now I don’t know which last name I should put on my flight tickets? And if this might get me in trouble at the Russian airport?

Should I use my Belgian passport for the flight to Turkey ? Or my Russian one ? And then also use my Russian passport for the flight to Russia ?

Thanks in advance