
By Jean-Raphaël Peytregnet
The National Security Strategy (NSS) published by the White House in November 2025 has had significant repercussions in the Asian region. This document comes in a context already marked by renewed Sino-American tensions, strategic realignments, and a reconfiguration of regional alliances. The NSS reviews the main developments observed in Asia: persistent and heightened tensions surrounding Taiwan, regional diplomatic dynamics, the growing role of allies, economic impacts, perceptions among Southeast Asian countries, and, finally, the adaptation of national strategies in an uncertain geopolitical environment.
Following a series of U.S. announcements— including significant arms sales to Taiwan (amounting to USD 11 billion, announced on December 18, 2025) and American and Japanese statements on the strategic importance of the Taiwan Strait—China intensified its military exercises around the island for two consecutive days (December 29– 30, 2025).
Maneuvers dubbed Justice Mission 2025 (Zhengyi shiming-2025 yanxi) involved several dozen Chinese naval vessels and aircraft, including artillery strikes and missile launches in areas closer to Taiwan than ever before.
Regional media interpreted these maneuvers as implicit attempts to intimidate Taipei and, in particular, Japan, following statements by Japan’s new Prime Minister in support of the island. In response to these exercises, several countries publicly expressed their “deep concerns,” judging China’s actions to be provocative and potentially destabilizing for regional and global security (see the joint statement by G7 foreign ministers, including France). For its part, the U.S. administration reaffirmed the strategic importance of the Indo Pacific and its interests in the region.
Taken together, these events have heightened the perceived risk of a military accident or a major crisis around Taiwan, which could escalate into a broader confrontation, even though leaders on all sides continue to seek to avoid open conflict.
In 2025, several important diplomatic initiatives were observed. In a context where some countries question U.S. commitment or fear a reversal in Washington’s policy toward them, they have sought to establish alternative platforms for cooperation. Thus, a trilateral meeting between South Korea, China, and Japan was held for the first time after more than a year-long hiatus. These countries emphasized cooperation in areas such as health and civilian technologies, thereby illustrating a desire to revive regional dialogues independently of Washington.
Similarly, strong activity was observed around initiatives such as the Quad (Quadrilateral Security Dialogue bringing together the United States, Japan, India, and Australia), through which these countries seek to harmonize their security strategies without necessarily making their entire policy dependent solely on the U.S. NSS.
China, in its own official statements, has attempted to temper the escalation by calling for cooperation and mutual respect, while firmly defending its sovereignty and development interests. A spokesperson from the Chinese Ministry of Foreign Affairs (Waijiaobu) notably explained that Beijing wished to work with the United States to promote a stable and sustainable relationship, while managing their differences constructively. Some Chinese analysts also view the NSS as a signal to engage in strategic dialogue with Washington. Nevertheless, Beijing still perceives the NSS as a containment strategy likely to increase tensions and regional instability.
Unlike Japan, China, and Taiwan, India did not officially react to the NSS. However, the American document assigns India a strategic role in the Indo-Pacific, positioning the subcontinent as a partner to contain China’s growing influence in the region. New Delhi views this strategy as validation of its regional importance, while allowing it to maintain its policy of “strategic autonomy,” which avoids full alignment with Washington.
The NSS indirectly encourages India to strengthen its military capabilities—particularly naval, air, and cyber—while modernizing its infrastructure to secure critical supply chains. On the economic front, the NSS offers New Delhi the opportunity to become an alternative hub to China-dependent supply chains, which should stimulate its industrial and technological development.
Japan’s increase in its defense budget to 2 percent of GDP, and Tokyo’s growing awareness of its strategic role in the region—particularly in a context of increasing rivalry with China—are in line with the spirit of the NSS. Tokyo’s stated objective is to reduce its dependence on U.S. protection while remaining a pillar of the regional security architecture. With the NSS, Tokyo receives confirmation of the strategic importance Washington assigns to it, particularly regarding the defense of Taiwan, which Japan considers vital to the stability of the archipelago.
The NSS also comes at a time when Washington is multiplying signals of support for Taipei, thereby prompting U.S. allies to clarify their own positions. This was the case on November 7, 2025, when Japan’s new Prime Minister stated before the Diet that an attack by China on Taiwan could constitute a “situation threatening Japan’s survival.” Although the NSS does not go into detail regarding Japanese statements, its publication reinforces a strategic climate that makes such positions more politically and militarily plausible.
South Korea, for its part, is investing heavily in high-technology systems, particularly precision missiles, while Australia continues to expand its maritime and submarine capabilities. These developments reflect a significant strategic shift for states that previously relied heavily on the United States for their security.
Beyond national defense spending, concrete cooperation has also been strengthened. The Balikatan (“shoulder to shoulder”) 2025 exercises between the Philippines and the United States were designed to be particularly intensive, including, for example, the integration of new coastal defense systems such as NMESIS (Naval/Maritime Expeditionary Ship Interdiction System, a mobile anti-ship system). These exercises demonstrate a strengthening of military ties that, despite overall strategic uncertainty, continue to consolidate the U.S. regional presence, particularly in areas close to Taiwan and Southeast Asia.
U.S. policies linked to the NSS, particularly within the framework of an “America First” agenda, have had direct economic repercussions in Asia. Sharp increases in U.S. tariffs have affected ASEAN countries’ exports, leading to a downturn in regional markets while strengthening China’s economic influence.
Studies show that Chinese companies are increasingly redirecting their exports toward Asian partners—particularly Vietnam, Indonesia, and Singapore—in order to circumvent U.S. trade sanctions, thereby highlighting a reorganization of global value chains and a strengthening of intra-Asian economic ties.
Media outlets and analysts in Southeast Asia have all noted that the NSS mentions the region very little, appearing only twice in the main text. This has led to the perception that Washington prioritizes other geographic areas, such as Latin America (the “Western Hemisphere”), and that the U.S. capital uses ASEAN more as a bargaining chip in its rivalry with China than as an autonomous strategic partner. Such strategic dilemmas may arise and push the countries concerned to diversify their alliances.
In response, several Southeast Asian countries have sought to diversify their strategies by strengthening their own intra-regional cooperation mechanisms, increasing bilateral discussions with Beijing, Tokyo, and New Delhi, and maintaining high-level dialogues with Washington on specific issues such as maritime security, high technology, and supply chains.
One of the most significant consequences of the NSS is the intensification of public and think-tank debates on security in Asia, the role of the United States, independent national strategies, and ways to ensure regional stability without exclusive dependence on Washington.
These debates focus in particular on issues such as burden sharing, national sovereignty, the integration of advanced military technologies, and the management of Sino-American rivalry so as to minimize the risks of accidental escalation.
Since the publication of the NSS, Asia has witnessed a combination of strategic realignments, heightened tensions, and efforts toward regional autonomy.
The Taiwan issue remains a focal point of tensions, with more visible Chinese military exercises prompting political reactions from U.S. allies. Traditional U.S. allies (Japan, South Korea, the Philippines, Thailand, as well as Taiwan) are strengthening their military capabilities or reaffirming their commitments to Washington, sometimes at the cost of intense domestic debates. The NSS acts as a clear signal that Asia must be more proactive and less dependent on the United States for its security. In Southeast Asia, countries are seeking to maintain a balance among the major powers while reassessing their economic and strategic priorities.
The United States emphasizes the role of the Indo-Pacific in its overall strategy, which ensures a certain level of deterrence against China and North Korea. Finally, the region is marked by a deep strategic debate on how to manage uncertainty surrounding U.S. commitment and the rise of China as a global power.
These trends show that, although the NSS may be perceived as a U.S. policy document centered on American interests—signaling an implicit revival of the Monroe Doctrine, whereby Washington places territorial security and domestic economic resilience at the core of its doctrine—its effects in Asia are concrete, complex, and multidimensional.
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A career diplomat who studied Chinese studies in France and then worked in development aid as an international expert for UNESCO in Laos (1988-1991), Jean-Raphaël PEYTREGNET has held positions including Consul General of France in Guangzhou (2007-2011) and Beijing (2015-2018), as well as in Mumbai/Bombay from 2011 to 2015. He was responsible for Asia at the Center for Analysis, Forecasting, and Strategy (CAPS) attached to the office of the Minister for Europe and Foreign Affairs (2018-2021) and finally Special Advisor to the Director for Asia-Oceania (2021-2023).