Bulgaria Analytica - Russia's Hidden War against the Southern Gas Corridor -

http://bulgariaanalytica.org/en/2018/06/10/russia-hidden-wars-in-the-southern-gas-corridor-is-the-igb-facing-the-fate-of-the-nabucco-pipeline-part-two/

The question asked and answered (to a degree) is whether Russia would succeed in blocking the IGB just as it did with Nabucco, denying CEE gas consumers access to competing gas 'streams' from the SGC and the global LNG market.