- Military alliances are shaping global security in 2026 as countries seek stronger defence guarantees amid rising geopolitical tensions
- NATO remains the leading collective-defence alliance, while partnerships involving Russia, North Korea, China and the United States influence security across Europe and Asia
- New regional defence agreements and African security blocs highlight how countries are adjusting their military partnerships to address emerging threats
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Global security in 2026 is increasingly shaped by military alliances, as countries seek reliable partners amid wars, regional rivalries and shifting balances of power.
Source: Getty Images
The 2026 US-Israel war with Iran has highlighted the limits of informal diplomatic relationships. Although Iran has ties with China and Russia, neither relationship carries NATO-style collective-defence obligations.
From established treaties to emerging regional partnerships, military alliances play a major role in determining how countries respond to threats, coordinate operations and strengthen their defence capabilities.
Here are 10 major military alliances and security partnerships shaping global power in 2026.
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1. NATO
The North Atlantic Treaty Organization (NATO) remains the world's leading collective-defence alliance. Its Article 5 provision states that an armed attack against one member is considered an attack against all, although each member determines the action it considers necessary in response.
In 2025, NATO members spent a combined $1.581 trillion on defence, accounting for approximately 55% of global military expenditure, according to the figures cited in the original report.
The alliance has invoked Article 5 only once, following the September 11, 2001, terrorist attacks on the United States.
With members across North America and Europe, NATO remains central to Western defence planning and deterrence against potential adversaries.
2. Russia–North Korea alliance
Russia and North Korea formalised their strategic partnership through a treaty signed in 2024, which includes a mutual-defence commitment.
The partnership brings together Russia's conventional military capabilities and substantial defence spending with North Korea's nuclear weapons programme, missile technology and large armed forces.
North Korea has also provided military assistance to Russia during the war in Ukraine, including troops and ammunition. The partnership has raised concerns among Western governments about closer military cooperation between the two countries.
3. China–North Korea alliance
China and North Korea have maintained a formal alliance since signing a mutual-assistance treaty in 1961.
The agreement commits both countries to provide assistance if either is subjected to armed attack. Their relationship dates back to China's intervention during the Korean War.
China contributes significant conventional military capabilities, including advanced aircraft, naval forces and nuclear weapons. North Korea brings its own nuclear arsenal, missile systems and heavily militarised forces.
However, the two countries' strategic interests do not always align, and their relationship is not equivalent to NATO's integrated collective-defence structure.
4. Saudi Arabia–Pakistan–Türkiye defence partnership
A developing defence partnership involving Saudi Arabia, Pakistan and Türkiye has attracted attention as regional powers seek closer security cooperation.
According to Business Insider Africa, a Mecca Joint Defence Agreement was signed on August 7, 2026, and reportedly treats an attack on one participating country as an attack on all three. The reported terms and operational status of the agreement require independent verification.
The three countries bring different strengths to the partnership. Saudi Arabia has substantial financial resources and defence spending, Pakistan possesses nuclear weapons, and Türkiye has a large military and an established role in NATO.
If implemented as described, the arrangement could strengthen security coordination among the three countries and influence the regional balance of power.
5. Collective Security Treaty Organisation
The Collective Security Treaty Organisation (CSTO) is a Russia-led security bloc comprising Belarus, Kazakhstan, Kyrgyzstan and Tajikistan, alongside Russia. Armenia has been a member but has suspended its participation in the organisation's activities.
The bloc is designed to coordinate defence and respond to security threats affecting its members.
In January 2022, the CSTO deployed peacekeeping forces to Kazakhstan during unrest in the country. The operation demonstrated its capacity to mobilise troops, although disagreements among members have raised questions about the organisation's unity and long-term effectiveness.
6. US–Japan alliance
The United States–Japan security alliance is a cornerstone of American strategy in the Indo-Pacific.
The partnership combines US military capabilities and extended nuclear deterrence with Japan's advanced maritime forces, missile-defence systems and growing defence capacity.
The alliance is particularly important amid tensions involving China, North Korea and disputed territory in the East China Sea, including the Senkaku Islands, which are administered by Japan and claimed by China.
Through joint exercises, intelligence sharing and the stationing of American forces in Japan, the two countries seek to deter potential aggression and maintain regional stability.
7. US–South Korea alliance
Established through the 1953 Mutual Defense Treaty after the Korean War, the US–South Korea alliance remains central to deterring North Korea.
More than 28,000 US troops are stationed in South Korea, supporting joint defence planning, military exercises and coordination between the two countries' armed forces.
The United States also provides extended nuclear deterrence, while South Korea continues to invest in conventional military capabilities, including advanced aircraft, missiles and naval systems.
The alliance faces ongoing challenges from North Korea's nuclear and missile programmes, making military readiness and cooperation key priorities for both governments.
8. US–Philippines alliance
The United States and the Philippines established their Mutual Defense Treaty in 1951. The alliance has gained renewed importance amid tensions in the South China Sea.
Washington has repeatedly reaffirmed its defence commitment to Manila, including its position that an armed attack on Philippine armed forces, public vessels or aircraft in the South China Sea would trigger the treaty's mutual-defence provisions.
The two countries have expanded joint military exercises and cooperation on access to defence sites. The original report also cited $144 million allocated by Washington for defence sites in 2026; the specific funding figure should be verified against official announcements.
The partnership is intended to strengthen the Philippines' defence capabilities and support a wider US security presence in the Indo-Pacific.
9. Alliance of Sahel States
The Alliance of Sahel States (AES) brings together Burkina Faso, Mali and Niger, three West African countries that withdrew from the Economic Community of West African States (ECOWAS).
The three governments established the alliance to deepen political, economic and security cooperation, particularly in response to armed insurgencies across the Sahel.
Their security strategies have increasingly involved cooperation with Russia, as the countries have reduced or ended some longstanding Western military partnerships.
The bloc has also pursued a joint military force, with the original report citing a planned force of 5,000 personnel. Its effectiveness depends on the members' ability to coordinate operations, share intelligence and address persistent militant violence across their territories.
10. ECOWAS security framework
The Economic Community of West African States (ECOWAS) remains an important regional organisation despite the withdrawal of Burkina Faso, Mali and Niger.
Its security framework includes plans for a regional Standby Force intended to support peacekeeping, crisis response and other collective security operations.
Following Niger's July 2023 coup, ECOWAS threatened military intervention to restore constitutional order but ultimately did not deploy a force.
The episode highlighted both the organisation's willingness to consider collective action and the political and operational challenges involved in carrying out regional military interventions.
Although the departure of the three Sahel countries has complicated regional cooperation, ECOWAS continues to pursue security coordination among its remaining members.
How military alliances are shaping global power in 2026
Military alliances vary considerably in their legal commitments, resources and ability to conduct joint operations. NATO has an established collective-defence structure, while other partnerships range from formal mutual-assistance treaties to regional security cooperation.
Their growing importance reflects a wider shift in international relations: countries increasingly seek dependable defence partners as conflicts, strategic competition and security threats become more complex.
However, a treaty does not automatically guarantee that every member will respond with the same military action. Political decisions, the wording of agreements and the circumstances of an attack all influence how alliances operate in practice.
Source: Legit.ng