HomeNATO Status Lists ...24. Protocol to the North Atlantic Treaty on the Accession of the Republic of Poland, done at Brussels December 16, 1997 hide 24. Protocol to the North Atlantic Treaty on the Accession of the Republic of Poland, done at Brussels December 16, 1997 Depositary – Treaty Affairs Office of Treaty Affairs Entered into force December 4, 1998. In accordance with Article II, the Protocol entered into force when each of the Parties to the North Atlantic Treaty notified the Government of the United States of America of its acceptance of the Protocol. Download Status List [92 KB] Tags Multilateral North Atlantic Treaty Organization Treaties