Article 33 1. Any State Party may denounce the present Protocol at any time by written notification addressed to the Secretary-General of the United Nations, who shall thereafter inform the other States Parties to the present Protocol and the Convention. Denunciation shall take effect one year after the date of receipt of the notification by the Secretary-General. 2. Such a denunciation shall not have the effect of releasing the St ate Party from its obligations under the present Protocol in regard to any act or situation that may occur prior to the date on which the denunciation becomes effective, or to the actions that the Subcommittee on Prevention has decided or may decide to take with respect to the State Party concerned, nor shall denunciation prejudice in any way the continued consideration of any matter already under consideration by the Subcommittee on Prevention prior to the date on which the denunciation becomes effective. 3. Following the date on which the denunciation of the State Party becomes effective, the Subcommittee on Prevention shall not commence consideration of any new matter regarding that State. Article 34 1. Any State Party to the present Protocol may propose an amendment and file it with the Secretary-General of the United Nations. The Secretary-General shall thereupon communicate the proposed amendment to the States Parties to the present Protocol with a request that they notify him whether they favour a conference of States Parties for the purpose of considering and voting upon the proposal. In the event that within four months from the date of such communication at least one third of the States Parties favour such a conference, the Secretary-General shall convene the conference under the auspices of the United Nations. Any amendment adopted by a majority of two thirds of the States Parties present and voting at the conference shall be submitted by the Secretary-General of the United Nations to all States Parties for acceptance. 2. An amendment adopted in accordance with paragraph 1 of the present article shall come into force when it has been accepted by a two -thirds majority of the States Parties to the present Protocol in accordance with their respective constitutional processes. 65