1. The Union and its Member States shall act jointly in a spirit of solidarity if a Member State is the object of a terrorist attack or the victim of a natural or man-made disaster. The Union shall mobilise all the instruments at its disposal, including the military resources made available by the Member States, to:

a) 
— prevent the terrorist threat in the territory of the Member States;
— protect democratic institutions and the civilian population from any terrorist attack;
— assist a Member State in its territory, at the request of its political authorities, in the event of a terrorist attack;

b) assist a Member State in its territory, at the request of its political authorities, in the event of a natural or man-made disaster.

2. Should a Member State be the object of a terrorist attack or the victim of a natural or man-made disaster, the other Member States shall assist it at the request of its political authorities. To that end, the Member States shall coordinate between themselves in the Council.

3. The arrangements for the implementation by the Union of the solidarity clause shall be defined by a decision adopted by the Council acting on a joint proposal by the Commission and the High Representative of the Union for Foreign Affairs and Security Policy. The Council shall act in accordance with Article 31(1) of the Treaty on European Union where this decision has defence implications. The European Parliament shall be informed.

For the purposes of this paragraph and without prejudice to Article 240, the Council shall be assisted by the Political and Security Committee with the support of the structures developed in the context of the common security and defence policy and by the Committee referred to in Article 71; the two committees shall, if necessary, submit joint opinions.

4. The European Council shall regularly assess the threats facing the Union in order to enable the Union and its Member States to take effective action.