BRUSSELS, May 27 - The head of Ukraine’s Naftogaz said on Thursday EU-mediated talks over future Russian gas transit via the country to Europe must include Gazprom and must be based on firm commitments, Reuters reported.

Commenting on an invitation from the bloc to relaunch trilateral gas talks, Naftogaz chief Andriy Kobolev voiced doubts over Russia’s willingness to engage in serious talks.

He said Russia’s energy minister has agreed to the talks but not Gazprom.