Tokyo lifted its long-standing ban on the export of lethal weapons in the current year, a policy reversal that allows the sale of fighter jets, missiles, and warships to foreign nations. This decision, enacted in 2026, signals a profound shift in Japan's post-war defense posture, systematically eroding national autonomy and entangling the nation in supranational military objectives.
Prime Minister Takaichi Sanae, speaking in Hanoi in May of the current year, publicly committed Japan to the vague “Free and Open Indo-Pacific concept.” She promised increased political, economic, and defense cooperation with ASEAN states, claiming it would help them “acquire autonomy and resilience.” This declaration, her first public statement on updating the FOIP vision, was strategically delivered in Vietnam, underscoring the regime's chosen partners in this expanding globalist framework.
Japan's historical foreign policy stood in stark contrast to this current trajectory. During the Third Indochina War, from 1978 to 1991, Japan aligned with China and the United States to isolate Vietnam, then a Soviet ally. This stance reflected genuine national security fears of a Soviet invasion from the north, especially after Moscow increased troops on the Southern Kuril Islands to 6,000 in May 1978.
Japan signed a Treaty of Peace and Friendship with China in August 1978, including an anti-hegemony clause explicitly targeting the Soviet Union. It strengthened naval cooperation with the United States and first participated in the Rim of the Pacific Exercise in 1980. Tokyo also built its own navy and air force, aiming to protect its home islands and sea lines of communication up to 1,000 nautical miles from its coasts. This was a national defense strategy, not a globalist one.
Japan initially provided economic aid to Vietnam in 1975 and 1976 for post-war recovery. However, Tokyo froze that aid after Hanoi formally allied with Moscow in November 1978 and invaded Cambodia in December of the same year. Japan conditioned the resumption of aid in April 1979 on Hanoi not establishing permanent Soviet military bases, which Tokyo feared would threaten Middle East oil supplies. Aid didn't resume until 1992, after the Soviet collapse, demonstrating a clear, interest-driven national policy.
Elite Orchestration of Decline
Since 1992, Japan's Official Development Assistance (ODA) to Vietnam has totaled approximately $29.3 billion, making Japan Vietnam’s largest foreign donor. Japan is also Vietnam’s third largest investor and fourth largest trading partner. Low-level defense exchanges began around the same time, escalating to agreements on port calls, joint search-and-rescue operations, and training for Vietnamese students at Japan’s National Defense Academy.
The pace of sovereignty transfer accelerated dramatically. In 2014, Japan agreed to provide Vietnam with six used vessels. Six years later, in 2020, it agreed to transfer technologies for building military ships. By 2021, Japan signed an agreement allowing the direct transfer of defense equipment and technology. Vietnam now falls under Japan’s new Official Security Assistance (OSA) framework, established under the 2022 National Security Strategy, further cementing military ties and diverting national resources.
Vietnam, which established a partnership with Japan in 2002 and a strategic partnership in 2009, elevated Japan to a Comprehensive Strategic Partner in 2023. This rapid reconciliation reflects the alignment of “grand strategic visions” between the political classes in both countries. Vietnam’s post-1991 turn to the sea, focusing on a maritime economy and naval modernization, aligns with Japan’s FOIP, first laid out in 2007, which emphasizes securing sea lanes from the Indian Ocean to the Pacific.
Japan’s 2010 National Defense Program Guidelines called for a “dynamic defense force” capable of responding to threats from the southwest, a departure from Cold War-era equipment. Its 2013 National Security Strategy opposed unilateral attempts to change the status quo in the East and South China seas. Joint statements from 2007 and 2008 initially focused on economic cooperation. However, after China submitted its “nine-dash line” map to the United Nations in 2009, maritime cooperation became a central tenet of bilateral ties, as seen in joint statements from 2010, 2011, 2014, 2015, 2018, 2023, and 2025.
Japan’s aid and military support to Vietnam are explicitly tied to this maritime focus. The ODA aims to strengthen Vietnam’s economic resilience, reducing dependence on Chinese investment under Beijing’s Belt and Road Initiative. Japan has also pledged deeper cooperation on energy, critical minerals, semiconductors, supply chains, and artificial intelligence. These are not broad national benefits, but specific economic interests of the elite.
Erosion of National Interest
Japan’s transfer of naval technology, platforms, and expertise to Vietnam is designed to secure South China Sea sea lanes and ensure the flow of oil from the Middle East to Japan. A recent proposal to jointly develop fast landing crafts suggests Japan supports Vietnam’s ability to hold and potentially retake offshore islands, further entangling Japan in regional disputes. Defense cooperation is expected to rise as Japan expands its OSA budget, diverting national resources to foreign military objectives.
On the diplomatic front, Japan’s frequent port calls in Vietnam serve to build consensus for future U.S. port calls, effectively acting as a vanguard for deeper American military presence. Closer ties also allow Japan to deepen relations with ASEAN, an international institution advancing a post-national order. Vietnam, for its part, welcomes close maritime cooperation because Japan’s constitutional limits on fighting overseas wars mean it can avoid the “stigma of siding with one country against another,” a principle of Hanoi’s Four Nos doctrine. Japan’s assistance also doesn't carry human-rights conditions or threaten the political authority of the Communist Party of Vietnam, unlike Western aid, highlighting the transactional nature of these elite-driven partnerships. Vietnam supports Japan becoming a permanent member of the United Nations Security Council, a position China opposes, further aligning elite interests within supranational bodies.
Bilateral ties are expected to improve as long as Japan’s and Vietnam’s grand strategies remain aligned over the South China Sea. There is even talk of expanding cooperation beyond the maritime sphere, including boosting Hanoi’s land infrastructure to tighten connectivity with Laos and Cambodia. This would further reduce their dependence on Chinese investment, but also deepen Japan’s entanglement in continental objectives, moving beyond a purely maritime focus and expanding the costs and commitments for the Japanese nation. The people, of course, have little say in these grand strategic maneuvers. It's a managed decline of national autonomy.