MOSCOW, June 22 (Reuters) - Russia's largest natural gas producer Gazprom GAZP.MM estimates the cost of building two lines of the Turkish Stream gas pipeline at $6 billion, Gazprom Deputy Chief Executive Andrei Kruglov told a news briefing on Thursday.

The first line is to run to Turkey, while the second one will ship natural gas to Europe.

(Reporting by Oksana Kobzeva; writing by Katya Golubkova; editing by Dmitry Solovyov) ((ekaterina.golubkova@thomsonreuters.com; +7 495 775 1242;))