Which organization operates on collective defense? By Kalsoom Tahir 🌐 Source International Affairs Review ✅ Fact Checked 📊 Difficulty Easy 📅 Last Updated 13 Aug 2026 A. UN B. WHO C. NATO D. IMF Check Answer 💡 Explanation: NATO's Article 5 establishes the principle of collective defense. 📚 Topics: International Organizations Politics and Government 🎯 Exams: CSS GEN NTS PMS