State Date of signature Date of receipt of the instrument of ratification or accession Poland Portugal Qatar Republic of Korea Republic of Moldova Romania Russian Federation Saudi Arabia Senegal Seychelles Sierra Leone Slovakia Slovenia Somalia South Africa Spain Sri Lanka Sudan Sweden Switzerland Tajikistan The former Yugoslav Republic of Macedonia Togo Tunisia Turkey Turkemistan Uganda Ukraine United Kingdom of Great Britain and Northern Ireland United States of America Uruguay Uzbekistan Venezuela Yemen Yugoslavia Zambia 13 January 1986 4 February 1985 26 July 1989 9 February 1989 11 January 2000 9 January 1995a 28 November 1995a 18 December 1990a 3 March 1987 23 September 1997a 21 August 1986 5 May 1992a a b 10 December 1985 4 February 1985 18 March 1985 29 May 1993a 16 July 1993a 24 January 1990a 10 December 1998 21 October 1987 3 January 1994a 29 January 1993 4 February 1985 4 June 1986 4 February 1985 4 February 1985 8 January 1986 2 December 1986 11 January 1995a 27 February 1986 12 December 1994a 18 November 1987 23 September 1988 2 August 1988 25 June 1999a 3 November 1986a 24 February 1987 15 March 1985 8 December 1988 18 April 1988 4 February 1985 21 October 1994 24 October 1986 28 September 1995a 29 July 1991 5 November 1991a 10 September 1991 7 October 1998a 25 March 1987 26 August 1987 25 January 1988 15 February 1985 18 April 1989 Accession. Succession. 44