Related Clues:
- International 30-Across
- Multi-country defense group
- Partnership for Peace international gp
- What’s spread evenly among UN: parts of alliance
- Alliance recently joined by Montenegro
- Mysterious force surrounding its place
- European defense grp
- Group with a secy.-gen
- Defense org. in Brussels
- Grp. joined by Montenegro in 2017
- Military alliance in collision at once
- Transoceanic alliance since 1949
- Gp. joined by Montenegro in 2017
- Brussels-based defense grp
- Alliance with its HQ in Brussels