Japan's Response to Iran's Nuclear Program and Regional Instability

Japanese Prime Minister Sanae Takaichi has publicly condemned Iran's nuclear program, emphasizing that the development of nuclear weapons by Iran must not be permitted. In her remarks on March 2, Takaichi stated, “We are working closely with the relevant countries and responding as necessary, including by gathering information on the situation.” While she expressed support for ongoing US-Iran talks regarding the nuclear issue, she refrained from commenting on whether Japan supports the recent US military strike on Tehran. This cautious approach reflects Japan's complex position as a key security ally of the United States while being heavily reliant on Middle Eastern oil.

The Straits TimesBloomberg

Japan's dependence on oil from the Middle East, which has hovered around 90% and reached 95.1% in January 2026, complicates its diplomatic messaging. The Strait of Hormuz, a vital passage for global oil transport, has become a focal point of concern following the US strike, leading to significant fluctuations in oil prices. On March 2, oil prices surged, marking the largest increase in four years, which could have dire implications for Japan's economy. Shunichi Suzuki, secretary-general of the ruling Liberal Democratic Party (LDP), noted that the situation could impact average Japanese households, stating, “The question of what happens to energy, crude, LNG, and the Strait of Hormuz is one that has a huge impact on the Japanese economy.”

The Straits Times

Economist Takahide Kiuchi from the Nomura Research Institute estimated that prolonged instability in Iran could reduce Japan's economic growth by 0.18 percentage points and increase inflation by 0.31 points, assuming oil prices rise to $87 per barrel. Following the US strike, Brent crude prices peaked at $82 per barrel before stabilizing. Despite these challenges, major Japanese oil refiners, including Idemitsu Kosan Co. and Cosmo Energy Holdings Co., have indicated that they do not anticipate immediate disruptions to crude supplies, citing sufficient domestic stockpiles and ongoing shipments.

Bloomberg

While Takaichi's administration has condemned Iran's nuclear ambitions, there is a notable call for caution. Suzuki emphasized the importance of understanding the historical context and Iran's position on nuclear development before making sweeping judgments. This sentiment reflects a broader concern within Japan about the potential economic fallout from escalating tensions in the region.

The Straits Times

Japan's response to Iran's nuclear program and the recent US military actions illustrates the delicate balance the country must maintain between supporting its ally and safeguarding its economic interests. As the situation evolves, Japan's government and businesses will continue to monitor developments closely, particularly regarding energy supplies and economic stability.

Bloomberg