Gary Wilson is Senior Lecturer in Law at Liverpool John Moores University. His main research interests concern collective security, the use of force, and issues of statehood and self-determination.

• Introduction 1. The Concept of Collective Security 2. The UN Charter’s System of Collective Security 3. A Brief Overview of Key Events of the UN Era 4. Diplomatic Responses to Security Threats 5. The Use of Non-Military Sanctions 6. Peacekeeping 7. Military Enforcement Action 8. The Role of Regional Arrangements Within The UN Collective Security System Conclusions

Gary Wilson is Senior Lecturer in Law at Liverpool John Moores University. His main research interests concern collective security, the use of force, and issues of statehood and self-determination.

• Introduction 1. The Concept of Collective Security 2. The UN Charter’s System of Collective Security 3. A Brief Overview of Key Events of the UN Era 4. Diplomatic Responses to Security Threats 5. The Use of Non-Military Sanctions 6. Peacekeeping 7. Military Enforcement Action 8. The Role of Regional Arrangements Within The UN Collective Security System Conclusions

Gary Wilson is Senior Lecturer in Law at Liverpool John Moores University. His main research interests concern collective security, the use of force, and issues of statehood and self-determination.

• Introduction 1. The Concept of Collective Security 2. The UN Charter’s System of Collective Security 3. A Brief Overview of Key Events of the UN Era 4. Diplomatic Responses to Security Threats 5. The Use of Non-Military Sanctions 6. Peacekeeping 7. Military Enforcement Action 8. The Role of Regional Arrangements Within The UN Collective Security System Conclusions