Gas Transmission System Operator of Ukraine (GTSOU) signed a memorandum of understanding on the harmonization of gas quality requirements at connection points with operators of the gas transmission systems of the CESEC (the Central and Southeastern Europe Energy Connectivity) countries, the company's press service reported. The document was signed on Tuesday in Budapest by GTSOU, Bulgartransgaz (Bulgaria), DESFA (Greece), FGSZ (Hungary), Nomagas (Northern Macedonia), PLINACRO (Croatia), PLINOVODI (Slovenia), Transgaz (Romania), Vestmoldtransgaz (Moldova) and ICGB (operator of the Greece-Bulgaria interconnector).