The Presidency of the Council of the European Union is organized according to a system introduced by the Treaty of Lisbon in 2009. The rotating presidency is held for a six-months period by each Member State, from January to June and from July to December (see, in this regard, the Council Decision of 1 January 2007).
The Member States holding the presidency cooperate closely in groups of three. The "Trio" establishes long-term objectives and lays down a shared agenda for a period of eighteen months, according to which each of the three countries puts forward its own six-monthly agenda. The Member State holding the rotating Presidency chairs all the meetings within the Council.
The current Trio is composed of the Romanian, Finnish and Croatian presidencies.
EU Presidency , EU Council , European Union