Where national defence organizations of contracting parties include declarations of intent (MoUs) or other written agreements relating to defence cooperation activities, within the framework of the responsibilities and defence authorities responsible for defence and established by the party concerned, such declarations of intent or other written agreement are subject to the agreement only if this agreement is explicitly invoked by these statements of intent or by other written agreements. The mechanism requires at least nine Member States to apply to the European Commission. If the Commission accepts it, it must be approved by qualified majority of all Member States in order to continue.  A member cannot veto enhanced cooperation, except in foreign policy.  In the Netherlands, partners can choose between two different types of housing, which are regulated by law: they can marry or enter into a registered partnership. It is also possible to sign a cohabitation agreement and, of course, to live together without signing a formal agreement. On 1 May 2013, a separate treaty amending Article 136 of the Treaty on the Functioning of the European Union (TFUE) authorising the creation of the ESM under EU law came into force.  In June 2015, an updated EMU reform plan, provided for by the ESM, should be implemented by an intergovernmental agreement that should be fully integrated into EU framework law in the medium term (between July 2017 and 2025).  1.4 This is voluntary cooperation between the contracting parties as an individual company and not as a Community company, joint venture or other legal entity, and each party remains responsible for its own activities and cannot legally engage or engage the other contracting party without further agreement. Although not formally members of EU law, several closely linked treaties have been signed between Member States outside the EU framework and its predecessors, as the EU was not empowered to act in this area. As a result of the EU`s autonomy acquis, the conventions have been gradually replaced by EU instruments. The 1968 Brussels Convention (on civil jurisdiction, replaced by the Brussels Regulation I), the 1980 Rome Convention on Contractual Obligations (on the choice of contractual law, is replaced by Rome I Regulation, with the exception of Denmark, the Dublin Convention of 1990 (relating to asylum seekers) , replaced by the Dublin II Regulation) and the 1995 Europol Convention (entered into EU jurisdiction by the Lisbon Treaty and replaced by a Council decision.
) In addition, several contracts have been concluded between a sub-group of EU Member States due to a lack of unanimity.