In another analysis on the subject, it was pointed out that Turkey doesn’t negotiate to be a transporter for the Russian gas, where Russia pays Turkey for transit but the gas continued to be Russian and Russia could sell to Europeans at whatever price. Turkey wants to buy gas at their eastern border and then resell it to the Europeans themselves. It would be difficult for Russia to get the same price from Turkey as they would get from the Europeans, unless Turks know nothing about margins.
Again, final details of the deal haven’t been released yet. But if Turkey had been an attractive option, Russians would’ve done it long ago.
Of course Russia would rather sell gas directly to Europe than through a Turk middleman, that’s why the Russians wanted the South Stream in the first place! Now the Russians will have to be dependent on NATO member Turkey who will control Russia’s gas transit into Southern Europe. What a win for the master chess champion Putin! He has really outsmarted the USA, the EU and NATO this time! snicker!