When the Cold War ended in the 1990s, NATO lost the main reason for its existence: a clear and powerful opponent in the Soviet Union.
It meant the West’s main military alliance had to redefine itself in a fragile global security environment marked by strategic competition and challenges from many new directions. It identified its core tasks as: deterrence and defence, crisis prevention and management, and cooperative security.
Decades later, NATO is still there. It is the world’s longest-surviving and most effective defence alliance. To a significant extent, this shows its ability to adapt while also sticking to the idea at its core – set out in Article 5 of the Washington Treaty, which founded it — that an attack on one member nation is an attack on all.
The 31-member group’s guiding document – the Strategic Concept – is updated every decade or so and was last redrawn in 2022. It shows that NATO’s culture of compromise is working after the Cold War. Here, we look at how it has adapted and the challenges it faces, starting with a summary of its main characteristics:
1. An open-door policy: The number of members has grown from its 16 original members
2. Deterrence and defence: Troops are kept at very high levels of readiness regardless of any changes to its command structure or troop numbers
3. Burden-sharing: The United States has insisted other members contribute more to costs
4. Russia & China: Russia remains identified as the biggest single threat. China is also on its list of top concerns as posing a systematic challenge to security in the Euro-Atlantic region.
5. Terrorism: Terrorism is defined as the most direct asymmetric threat to the security of NATO citizens
Enlargement and opposition
Relations between Russia and the West have been volatile. Even during better times, Moscow has been consistent in opposing NATO expansion, viewing it as a plan to encircle the country.
Despite its concerns, Russia has had to accept nations formerly within its sphere of influence joining the alliance, including countries on the Baltic and from eastern and central Europe.
Read more: Will the Baltic Sea become a new arena for confrontation between Russia and the West?