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Declaration concerning the Laws of Naval War. London, 26 February 1909.
Final provisions - Art. 69.
Art. 69. In the event of one of the Signatory Powers wishing to denounce the present Declaration, such denunciation can only be made to take effect at the end of a period of twelve years, beginning sixty days after the first deposit of ratifications, and, after that time, at the end of successive periods of six years, of which the first will begin at the end of the period of twelve years.
Such denunciation must be notified in writing, at least one year in advance, to the British Government, which shall inform all the other Powers.
It will only operate in respect of the denouncing Power.