Artikel 6

1. This Memorandum shall enter into force upon the signatures of the Government of the Kingdom of Belgium, the Government of Canada, the Government of the Federal Republic of Germany, the Government of the Italian Republic, the Government of the Kingdom of the Netherlands, the Government of the United Kingdom of Great Britain and Northern Ireland, and the Government of the United States of America, on the one hand, and the Government of the Republic of Bulgaria, the Government of the Czech and Slovak Federal Republic, the Government of the Republic of Poland and the Government of the Union of Soviet Socialist Republics, on the other hand, effective August 20, 1991, and shall remain in force until otherwise agreed by the Parties. The Annexes to this Memorandum are an integral part thereof.
2. Any Party may declare, upon signature, that this Memorandum shall enter into force for that Party only after notification to all other Parties that all legal requirements have been met. This Memorandum shall enter into force for that Party upon receipt of such notification by all other Parties.