KIEV, Aug. 20 - Ukraine may pull out of the Common Economic Space, a trade bloc that includes Russia, Kazakhstan and Belarus, after Moscow has demanded a much greater degree of integration out of the group, Economy Minister Serhiy Teriokhin said Friday.

Russian Economic and Trade Minister German Gref, on a visit to Kiev Friday, said that creation of a customs union and a proposed supranational governing body were the key elements of the bloc.