The States Parties to the present Protocol and to the Vienna Convention on Diplomatic Relations, hereinafter referred to as "the Convention", adopted by the United Nations Conference held at Vienna from 2 March to 14 April 1961,

Expressing their wish to resort in all matters concerning them in respect of any dispute arising out of the interpretation or application of the Convention to the compulsory jurisdiction of the International Court of Justice, unless some other form of settlement has been agreed upon by the parties within a reasonable period,

Have agreed as follows:
 

Disputes arising out of the interpretation or application of the Convention shall lie within the compulsory jurisdiction of the International Court of Justice and may accordingly be brought before the Court by an application made by any party to the dispute being a Party to the present Protocol.
 

The parties may agree, within a period of two months after one party has notified its opinion to the other that a dispute exists, to resort not to the International Court of Justice but to an arbitral tribunal. After the expiry of the said period, either party may bring the dispute before the Court by an application.
 

1.    Within the same period of two months, the parties may agree to adopt a conciliation procedure before resorting to the International Court of Justice.

2.    The conciliation commission shall make its recommendations within five months after its appointment. If its recommendations are not accepted by the parties to the dispute within two months after they have been delivered, either party may bring the dispute before the Court by an application.
 

States Parties to the Convention, to the Optional Protocol concerning Acquisition of Nationality,l and to the present Protocol may at any time declare that they will extend the provisions of the present Protocol to disputes arising out of the interpretation or application of the Optional Protocol concerning Acquisition of Nationality. Such declarations shall be notified to the Secretary-General of the United Nations.
 

The present Protocol shall be open for signature by all States which may become Parties to the Convention, as follows: until 31 October 1961 at the Federal Ministry for Foreign Affairs of Austria and subsequently, until 31 March 1962, at the United Nations Headquarters in New York.
 

The present Protocol is subject to ratification. The instruments of ratification shall be deposited with the Secretary-General of the United Nations.
 

The present Protocol shall remain open for accession by all States which may become Parties to the Convention. The instruments of accession shall be deposited with the Secretary-General of the United Nations.
 

1.    The present Protocol shall enter into force on the same day as the Convention or on the thirtieth day following the date of deposit of the second instrument of ratification or accession to the Protocol with the Secretary-General of the United Nations, whichever day is the later.

2.    For each State ratifying or acceding to the present Protocol after its entry into force in accordance with paragraph 1 of this Article, the Protocol shall enter into force on the thirtieth day after deposit by such State of its instrument of ratification or accession.
 

The Secretary-General of the United Nations shall inform all States which may become Parties to the Convention:

(a)    of signatures to the present Protocol and of the deposit of instruments of ratification or accession, in accordance with Articles V, VI and VII;

(b)    of declarations made in accordance with Article IV of the present Protocol;

(c)    of the date on which the present Protocol will enter into force, in accordance with Article VIII.
 

The original of the present Protocol, of which the Chinese, English, French, Russian and Spanish texts are equally authentic, shall be deposited with the Secretary-General of the United Nations, who shall send certified copies thereof to all States referred to in Article V.
 

IN WITNESS WHEREOF the undersigned Plenipotentiaries, being duly authorized thereto by their respective Governments, have signed the present Protocol.

DONE at Vienna, this eighteenth day of April one thousand nine hundred and sixty-one.