MOSCOW, June 29 - Ukraine's current efforts to incorporate European gas laws into its national legislation could bar it from integration with Russia, said Valery Yazev, State Duma deputy speaker and president of the Russian Gas Society.

"If they are implementing it (the legislation) in a pure form, then they will close the road towards integration with Russia," he told a press conference at the Interfax head office.

In particular, implementing the European legislation will require Ukraine to lift the existing ban on privatization of its gas transportation system (GTS), but at the same time there will be difficulties for Gazprom in receiving a stake in the Ukrainian GTS.