Japan's arms export shift set to intensify naval shipbuilding rivalry with Korea

Japan's decision to lift decades-old arms export restrictions is expected to sharpen competition with South Korean defense shipbuilders in the naval sector, analysts said, as Tokyo moves to translate its manufacturing capabilities into overseas contracts.

The policy shift matters for South Korea's defense exporters — including HD Hyundai Heavy Industries and Hanwha Ocean — who have built a global edge in continuous production and system improvement. For OC's Korean-American community, the development touches directly on the economic fortunes of flagship Korean conglomerates.

Japan's Mitsubishi Heavy Industries was selected as the preferred contractor for Australia's SEA 3000 frigate program, marking a milestone for Tokyo's push into international naval markets, the Korea Times reported.

Analysts are split on the near-term impact. "My view is that Tokyo's recent policy shift will not pose any short-term threats to most Korean defense players," said Kim Dae-young, a military analyst, according to the Korea Times. "It also remains uncertain whether Japanese companies can develop platforms tailored to the needs of other countries, particularly in Southeast Asia."

Japan's advantages lie partly in diplomatic soft power. "In Southeast Asia, Japan is widely regarded as a more reliable partner than Korea due to the former's long-standing engagement through official development assistance, which could translate into stronger naval export opportunities," Yang Uk of the Asan Institute for Policy Studies told the Korea Times.

Still, Japan faces structural limits. Kim noted that "Japan does not yet have sufficient capacity to aggressively pursue overseas exports, given its reliance on domestic orders from its Self-Defense Forces."

South Korea's edge, a defense industry source told the Korea Times, stems from scale and consistency: "Compared with Japan, which has focused on limited domestic production, Korea has consistently manufactured and improved weapons systems for global markets, ranging from tanks to ammunition."

Analysts identify the naval and maritime sector as the most likely arena for intensifying Japan-Korea rivalry, given Japan's P-1 maritime patrol aircraft and Taigei-class diesel-electric submarines, while ground systems such as tanks and self-propelled artillery remain a clear Korean strength.

Analysts say ground systems such as tanks and self-propelled artillery remain a clear South Korean advantage, with the naval sector emerging as the primary competitive battleground between the two countries in the years ahead.