KIEV, July 26 – Ukraine has not discarded the 3+1 formula of its cooperation with the Customs Union but is also carefully studying the proposals of the Russian side, Prime Minister Mykola Azarov said.

"We are currently studying the operation of the Customs Union, we are looking into what is positive about it. We have already offered our formula of working with the Customs Union. Unfortunately, this formula is not accepted by our partners, but we do not discard this idea. We want to work with the Customs Union indeed. And we are carefully studying the latest offer by the Russian President [Vladimir] Putin," he said in an interview with the Russian newspaper Zavtra (Tomorrow).