South Korea’s traditional security concerns have primarily centered on addressing immediate regional challenges, particularly the persistent threat posed by North Korea, within the framework of its longstanding alliance with the United States. However, recent developments suggest a strategic expansion of Seoul’s diplomatic and security objectives, as it seeks to engage more actively with international organizations such as NATO and other key regional actors like India and Australia.
This shift reflects South Korea’s recognition of the necessity for a more diversified security posture in response to an increasingly complex and interconnected geopolitical environment, signaling a significant evolution in its approach to both regional and global security dynamics.
In July 2023, South Korea’s participation in the NATO summit held in Washington marked its third consecutive invitation as an Indo-Pacific partner, alongside Japan, Australia and New Zealand.
This involvement underscores a profound shift in South Korea’s security policy, which for over 75 years had been predominantly focused on its bilateral alliance with the United States. Historically, this relationship was considered sufficient to ensure South Korea’s security and maintain regional stability, leading Seoul to rely on the US as its primary defense guarantor without actively pursuing additional security partnerships.
However, South Korea’s strategic outlook is undergoing a significant transformation in response to the evolving regional security landscape. The rise of China’s military capabilities, North Korea’s advancing nuclear weapons program and the increasing military cooperation among China, Russia and North Korea have collectively prompted Seoul to reassess its reliance on the United States as the sole pillar of regional stability.
South Korea’s expanding engagement with NATO is emblematic of this recalibration of its foreign and security policy, reflecting a broader strategic realignment aimed at enhancing its security through diversified partnerships.
Historical context and evolution
The relationship between South Korea and NATO began evolving in the early years of this century, transitioning from limited engagement to a comprehensive partnership focused on shared global security interests. South Korea’s formal ties with NATO were first established in 2005 with the creation of a dedicated mission, followed by its designation as a “global partner” in 2012. This status facilitated deeper cooperation in areas such as cybersecurity, counterterrorism and non-proliferation, reflecting the shared commitment of both parties to addressing pressing global security challenges.
Since then, South Korea has actively participated in various NATO-led initiatives, including joint military exercises and high-level dialogues. Notably, it contributed to the Resolute Support Mission in Afghanistan and has collaborated with NATO’s Cooperative Cyber Defencs Center of Excellence (CCDCOE). South Korea’s involvement in the 2021 “Locked Shields” cyber defense exercise further highlighted its commitment to enhancing global cybersecurity.
These efforts align with South Korea’s broader strategic objective of elevating its role as a global security contributor. The increase in South Korea’s defense spending, rising from 2.4% of GDP in 2005 to 2.7% in 2023, further underscores its growing investment in national defense and its desire to contribute meaningfully to global security efforts.
Key drivers of engagement
The factors driving South Korea’s increasing engagement with NATO are multifaceted and interconnected. Shared concerns regarding regional stability, particularly in response to North Korea’s nuclear provocations, rising military tensions in the South China Sea and the growing threat of cyberattacks, have facilitated enhanced cooperation between South Korea and NATO. This convergence of security interests has enabled collaboration in non-traditional security areas such as cybersecurity, maritime security, and counterterrorism.
Additionally, while South Korea remains firmly committed to its alliance with the United States, its engagement with NATO represents a strategic effort to diversify its security partnerships. This diversification strategy reflects South Korea’s desire to enhance its diplomatic flexibility and expand its security options in response to the rapidly changing global security environment.
As a middle power with considerable economic and technological capabilities, South Korea is increasingly positioning itself as an active participant in global security governance. Its engagement with NATO allows it to extend its influence beyond the Korean Peninsula, contributing to international peacekeeping, humanitarian assistance, and disaster relief efforts.
Moreover, the Indo-Pacific has emerged as a focal point of global geopolitical competition, driven by the growing attention of both the United States and NATO to the region in response to China’s assertive policies. By strengthening its ties with NATO, South Korea aligns itself with a broader coalition dedicated to preserving a rules-based international order in the Indo-Pacific.
Key areas of cooperation
Currently, collaboration between South Korea and NATO has expanded far beyond security issues and strategic alignment. It now encompasses a range of practical areas that reflect shared security interests and global challenges. Cybersecurity has become a key area of cooperation, with South Korea and NATO exchanging knowledge and technical expertise to counter the increasing prevalence of cyber threats.
In the realm of counterterrorism, both partners have engaged in the sharing of intelligence and the development of strategies to combat extremism and terrorism. Non-proliferation remains a critical component of the partnership, with NATO supporting diplomatic efforts to denuclearize the Korean Peninsula and South Korea contributing to discussions on arms control and the prevention of the spread of weapons of mass destruction.
Maritime security is another area of focus, with both parties collaborating on safeguarding international waters and countering piracy, particularly in strategically important regions such as the South China Sea and the Gulf of Aden.
South Korea’s participation in NATO-led military exercises has enhanced interoperability and operational readiness, while joint research in defense technology has driven innovation in areas such as missile defense, autonomous systems, and artificial intelligence.
Crisis management and humanitarian assistance are also becoming central to the partnership, with both partners emphasizing coordinated efforts in responding to natural disasters and large-scale emergencies. Energy security has emerged as another growing area of cooperation, with a focus on protecting critical infrastructure from cyberattacks, terrorism, and political instability.
Impacts on regional security dynamics
South Korea’s deepening engagement with NATO has significant implications for the security architecture of the Indo-Pacific region. This partnership introduces an additional layer of security for South Korea at a time when US strategic focus is increasingly diverted toward crises in other parts of the world, such as Ukraine and the Middle East. However, this expanded cooperation necessitates careful diplomatic and strategic management to avoid potential divergences or disruptions to the status quo and the established balance of power in the region.
South Korea’s closer ties with NATO have raised concerns in China, Russia and North Korea, which perceive NATO’s increasing presence in the Indo-Pacific as part of a broader strategy to contain their influence and interests in the region. These three countries have already begun to strengthen their bilateral and trilateral relationships, further complicating the regional security landscape.
The possibility of a conflict akin to the Ukraine crisis erupting in the Indo-Pacific cannot be entirely dismissed. While South Korea is endeavoring to maintain a balanced diplomatic stance, avoiding overt antagonism toward China and Russia, its deepening relationship with NATO introduces additional variables into the regional power dynamics. Disrupting the current power equations and the status quo carries both potential benefits and risks for South Korea. Consequently, South Korea may need to carefully assess the extent to which it seeks NATO’s involvement in its regional security affairs.
To address South Korea’s concerns, which are pushing it toward actions that risk disrupting the prevailing security equations in the region and potentially triggering an arms race or conflict, other regional security actors, such as India, Japan, and Australia, may need to recalibrate their security policies to assuage South Korea’s apprehensions and to maintain the balance of power, peace, and stability.
Enhancing their collaboration with South Korea could reassure it that it has the support of regional powers regarding its external security needs. Strengthening these security partnerships could reduce the perceived necessity for South Korea to seek security guarantees from external actors, which might provoke China, Russia, and North Korea into adopting further extreme measures, potentially escalating tensions and increasing the risk of a nuclear crisis in the region.
Challenges ahead
The deepening NATO-South Korea partnership, while beneficial, faces significant challenges. Domestically, opinions in South Korea are divided over closer ties with NATO, particularly regarding the impact on the country’s foreign policy and national security priorities. The lack of domestic consensus is one of the most significant obstacles to this growing partnership. Pro-China factions within South Korean politics are increasingly uneasy about deepening relations with NATO, complicating the government’s strategic calculations. The current government, under President Yoon, must navigate these internal divisions carefully while pursuing expanded international engagements.
Regionally, South Korea’s engagement with NATO in the Indo-Pacific requires navigating complex geopolitical sensitivities, particularly with ASEAN member states and other regional actors who may have differing views on NATO’s involvement in Asia. Ensuring that South Korea’s NATO engagement complements, rather than complicates, existing regional security arrangements will be critical.
The sustainability of South Korea’s partnership with NATO will depend on both parties’ ability to achieve tangible outcomes from their cooperation. This includes overcoming bureaucratic, political, economic, and cultural obstacles that may hinder effective collaboration, while ensuring the partnership remains mutually beneficial.
South Korea’s growing involvement with NATO reflects a strategic effort to diversify its security partnerships, strengthen its role in global security governance, and address emerging threats in the Indo-Pacific. This partnership aligns with Seoul’s broader foreign policy goals of diversification and proactive global engagement. However, it also introduces challenges that require careful management.
As global and regional security dynamics continue to evolve, South Korea’s partnership with NATO is likely to deepen further, shaped by the interplay of national interests, regional security concerns, and broader geopolitical shifts.
Lakhvinder Singh is director of peace and security studies at the Asia Institute in Seoul.