ATHENS/MOSCOW (Reuters) - President Vladimir Putin and Greek Prime Minister Alexis Tsipras discussed plans on Friday for a pipeline to carry Russian gas to Europe via Turkey and agreed to meet in Russia in two weeks, the Kremlin said. It said the two leaders, who spoke by telephone, would meet at an annual business conference taking place in Russia's second city of St Petersburg on June 18-20. The Kremlin gave no details of the discussions on the pipeline dubbed Turkish Stream, which is planned as an alternative to the South Stream project scrapped by Moscow in December.