Article 10 of the treaty:
The Parties may, by unanimous agreement, invite any other European State in a position to further the
principles of this Treaty and to contribute to the security of the North Atlantic area to accede to this
Treaty. Any State so invited may become a party to the Treaty by depositing its instrument of accession
with the Government of the United States of America. The Government of the United States of America
will inform each of the Parties of the deposit of each such instrument of accession.
