The Ukrainian government is currently analyzing which documents of the Customs Union, formed by Russia, Belarus and Kazakhstan, the country may join, President Viktor Yanukovych said.

"Ukraine has not joined any of the [Customs Union] documents, which, doubtless, is creating problems in cooperation today both for the countries of the Customs Union and Ukraine. That is why the Ukrainian government, which has received these documents, is studying them today," the Ukrainian president told reporters on Thursday.

"After all of the conclusions are drawn, certain transparent decisions will be made concerning the principles that we will be able to join," he said.