Turkey is switching part of its payments for Russian gas to roubles and plans to extend use of the Russian Mir payment system to deepen economic ties, Turkish President Recep Tayyip Erdoğan said on Saturday, after a meeting with Russian counterpart Vladimir Putin. A new “road map” to boost cooperation will serve as a “source of power between Turkey and Russia in financial terms,” Erdoğan told reporters on his return flight from Sochi where he met Putin on Friday, state news agency Anadolu reported. Five Turkish banks are working to extend the use of the Mir payment system in Turkey, Erdoğan sa…