Ukrainian President Petro Poroshenko spoke with EU leaders in Brussels about the possible involvement of European companies in the modernization and management of the Ukrainian gas transportation system (GTS).

"We have discussed prospects for European companies participating in the modernization of the Ukrainian gas transport system, and their taking part in running the system. And we will persistently continue this work," he said in the joint press conference in Brussels that he attended together with NATO Secretary General Jens Stoltenberg on Thursday.