The meeting between Vladimir Putin and Prime Minister Recep Tayyip Erdogan may come as part of the Supreme Cooperation Council session scheduled to be held before the end of November in Kazan, Turkish Ambassador Ümit Yardim told RIA Novosti news agency in Moscow.
Ankara obtained a 10.25 percent price discount on the 28-30 billion cubic meters (bcm) of gas it buys from Russia, Turkish Energy Minister Taner Yildiz said in February, but the discount, which should have been in effect as of January 2015, still needs a final signature.
Another sticking point in talks has been Russia's insistence that Ankara grant permits for the construction work on four planned lines in the project. Turkey has so far only given licenses for the first line.
Turkish Stream is the working name of the proposed natural gas pipeline from the Russian Federation to Turkey under the Black Sea. The proposal was announced by President Vladimir Putin in December 2014, during his state visit to Turkey.
The proposed pipeline should replace the cancelled South Stream project.
It is supposed to bring 63 bcm of gas per year to Turkey and to southern Europe via Greece by 2020. The first phase of the pipeline was expected to be operational by 2017 and to carry 15.75 bcm of gas.
The first direct gas pipeline between Russia and Turkey was the Blue Stream, commissioned in 2005. The expansion plan was replaced later by the South Stream.
In 2009, Putin proposed a line parallel to Blue Stream 1 under the Black Sea, from Samsun to Ceyhan, and further to Syria, Lebanon and Cyprus.