– the European Convention on Extradition, opened for signature in Paris, on 13 December 1957 (ETS No. 24); – the European Convention on Mutual Assistance in Criminal Matters, opened for signature in Strasbourg, on 20 April 1959 (ETS No. 30); – the Additional Protocol to the European Convention on Mutual Assistance in Criminal Matters, opened for signature in Strasbourg, on 17 March 1978 (ETS No. 99). 2 If two or more Parties have already concluded an agreement or treaty on the matters dealt with in this Convention or have otherwise established their relations on such matters, or should they in future do so, they shall also be entitled to apply that agreement or treaty or to regulate those relations accordingly. However, where Parties establish their relations in respect of the matters dealt with in the present Convention other than as regulated therein, they shall do so in a manner that is not inconsistent with the Convention’s objectives and principles. 3 Nothing in this Convention shall affect other rights, restrictions, obligations and responsibilities of a Party. Article 40 – Declarations By a written notification addressed to the Secretary General of the Council of Europe, any State may, at the time of signature or when depositing its instrument of ratification, acceptance, approval or accession, declare that it avails itself of the possibility of requiring additional elements as provided for under Articles 2, 3, 6 paragraph 1.b, 7, 9 paragraph 3, and 27, paragraph 9.e. Article 41 – Federal clause 1 A federal State may reserve the right to assume obligations under Chapter II of this Convention consistent with its fundamental principles governing the relationship between its central government and constituent States or other similar territorial entities provided that it is still able to co-operate under Chapter III. 2 When making a reservation under paragraph 1, a federal State may not apply the terms of such reservation to exclude or substantially diminish its obligations to provide for measures set forth in Chapter II. Overall, it shall provide for a broad and effective law enforcement capability with respect to those measures. 3 With regard to the provisions of this Convention, the application of which comes under the jurisdiction of constituent States or other similar territorial entities, that are not obliged by the constitutional system of the federation to take legislative measures, the federal government shall 58