State party Date of entry into force Portugal Russian Federation Senegal Serbia and Montenegro Slovakia 11 March 1989 1 October 1991 16 October 1996 12 March 2001 17 April 1995 Slovenia South Africa Spain Sweden Switzerland 16 July 1993 10 December 1998 20 November 1987 26 June 1987 26 June 1987 Togo Tunisia Turkey Uruguay Ukraine 18 December 1987 23 October 1988 1 September 1988 26 June 1987 12 September 2003 Venezuela 26 April 1994 States parties that have only made the declaration provided for in article 21 of the Convention, as at 21 May 2004 Japan Uganda United Kingdom of Great Britain and Northern Ireland United States of America 29 June 1999 19 December 2001 8 December 1988 21 October 1994 States parties that have only made the declaration provided for in article 22 of the Convention, as at 21 May 2004b Burundi Azerbaijan Guatemala Mexico Seychelles 10 June 2003 4 February 2002 25 September 2003 15 March 2002 6 August 2001 a Total of 51 States parties. b A total of 56 States parties have made the declaration under article 22. 107