Participant Tajikistan The former Yugoslav Republic of Macedonia Timor-Leste Togo Tunisia Signature 11 January 1995a 12 December 1994b 25 March 1987 26 August 1987 Turkey Turkmenistan Uganda Ukraine United Kingdom of Great Britain and Northern Ireland 25 January 1988 United States of America Uruguay Uzbekistan Venezuela (Bolivarian Republic of) Yemen 18 April 1988 4 February 1985 27 February 1986 15 March 1985 15 February 1985 b Succession (6 countries). 86 2 August 1988 25 June 1999a 3 November 1986a 24 February 1987 8 December 1988 21 October 1994 24 October 1986 28 September 1995a 29 July 1991 7 October 1998a Notes Accession (71 countries). 16 April 2003a 18 November 1987 23 September 1988 5 November 1991a Zambia a Ratification, Accession (a), Succession (b)