| 1. | NATO
 - 20th-century military alliances,
- 21st-century military alliances,
- Anti-communism,
- Cold War treaties,
- Foreign relations of the Soviet Union,
- International military organizations,
- Military alliances involving Belgium,
- Military alliances involving Bulgaria,
- Military alliances involving Canada,
- Military alliances involving Estonia,
- Military alliances involving France,
- Military alliances involving Greece,
- Military alliances involving Hungary,
- Military alliances involving Italy,
- Military alliances involving Latvia,
- Military alliances involving Lithuania,
- Military alliances involving Luxembourg,
- Military alliances involving Poland,
- Military alliances involving Portugal,
- Military alliances involving Romania,
- Military alliances involving Spain,
- Military alliances involving Turkey,
- Military alliances involving the Netherlands,
- Military alliances involving the United States,
- Multiregional international organizations,
- NATO,
- Organisations based in Belgium,
- Organizations established in 1949,
- Supraorganizations
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