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This Protocol shall be open for signature at Kiev (Ukraine) from 21 to 23 May 2003 on the occasion of the fifth Ministerial Conference ``Environment for Europe," and thereafter at United Nations Headquarters in New York until 31 December 2003, by all States which are members of the United Nations and by regional economic integration organizations constituted by sovereign States members of the United Nations to which their member States have transferred competence over matters governed by this Protocol, including the competence to enter into treaties in respect of these matters.