The Helsinki Treaty. Treaty of Co-operation between Denmark, Finland, Iceland, Norway and Sweden

Treaty of Co-operation between Denmark, Finland, Iceland, Norway and Sweden (the Helsinki Treaty) was signed on 23 March 1962 and entered into force on 1 July 1962. The original text has been amended by Agreements that were signed on 13 February 1971, 11 March 1974, 15 June 1983, 6 May 1985, 21 August 1991, 18 March 1993, and 29 September 1995. The most recent amendments entered into force on 2 January 1996.