Ereni 7.11 ターキッシュストリーム “Moscow’s pointing to the recent tensions with Ankara as the main reason for slowing down the Turkish Stream project is perhaps just a way of saving face when the costs of currently implementing it would be difficult for Russia to bear.”/( トルコ ロシア 外交 石油ガス パイプライン ガスプロム トルコストリーム