Artikel 3

1. Each Party shall take such measures as may be necessary to establish its jurisdiction over the relevant offences when the offence is committed on board a vessel flying its flag.
2. For the purposes of applying this Agreement, each Party shall take such measures as may be necessary to establish its jurisdiction over the relevant offences committed on board a vessel flying the flag or displaying the marks of registry or bearing any other indication of nationality of any other Party to this Agreement. Such jurisdiction shall be exercised only in conformity with this Agreement.
3. For the purposes of applying this Agreement, each Party shall take such measures as may be necessary to establish its jurisdiction over the relevant offences committed on board a vessel which is without nationality, or which is assimilated to a vessel without nationality under international law.
4. The flag State has preferential jurisdiction over any relevant offence committed on board its vessel.
5. Each State may, at the time of signature or when depositing its instrument of ratification, acceptance, approval or accession, or at any later date, by a declaration addressed to the Secretary General of the Council of Europe, inform the other Parties to the agreement of the criteria it intends to apply in respect of the exercise of the jurisdiction established pursuant to paragraph 2 of this article.
6. Any State which does not have in service warships, military aircraft or other government ships or aircraft operated for non-commercial purposes, which would enable it to become an intervening State under this Agreement may, at the time of signature or when depositing its instrument of ratification, acceptance, approval or accession, by a declaration addressed to the Secretary General of the Council of Europe declare that it will not apply paragraphs 2 and 3 of this Article. A State which has made such a declaration is under the obligation to withdraw it when the circumstances justifying the reservation no longer exist.