1. When enhanced cooperation is being established, it shall be open to all Member States, subject to compliance with any conditions of participation laid down by the authorising decision. It shall also be open to them at any other time, subject to compliance with the acts already adopted within that framework, in addition to those conditions.

The Commission and the Member States participating in enhanced cooperation shall ensure that they promote participation by as many Member States as possible.

2. The Commission and, where appropriate, the High Representative of the Union for Foreign Affairs and Security Policy shall keep the European Parliament and the Council regularly informed regarding developments in enhanced cooperation.