Gas grid operators on the Trans-Balkan corridor have been working to enable traders to access natural gas via Greek LNG terminals or pipelines for shipments to Ukraine at a unified discounted tariff.The bundled transmission capacity product launched in May could open opportunities for diversification and tightening security of supply.Nevertheless, many traders say the format may not be compliant with EU network codes and insist they had limited information prior to the first auction held in May.As the five TSOs are preparing a new round of auctions, the Greek regulator RAE has started a consultation and companies are expected to submit their views by 9 June 2025.ICIS reporter Aura Sabadus has collected 15 questions from gas traders active regionally and invited Sotirios Bravos (DESFA), Nikola Delev, (Bulgartransgaz), Marius Lupean, (Transgaz), Liviu Duminica, (VMTG) and Andrii Prokofiev (GTSOU) to answer them in detail.