88% of documents necessary for Russia-Belarus-Kazakhstan customs establishment union have already been signed, EurAsEC Secretary General Tair Mansurov reported to Kazakh President Nursultan Nazarbaev on Thursday, the President''s press service reported.

Negotiations are continued to reach sign the rest of the documents.

Mansurov said six more international agreements will be signed in June at the meeting of the Heads of states. It is expected that the Heads of states will adopt customs code of EurAsEC Economic Community and Customs Union.

"Another meeting of the Heads of States is planned for the end of the year, where a number of additional documents will be adopted. This would allow to start working on Customs Union establishment within EurAsEC in the beginning of 2010," Mansurov said.