JAPAN PERSPECTIVE

Tokyo, June 15, 2026. The announcement of a deal between Washington and Tehran to end their conflict and reopen the Strait of Hormuz triggered an immediate and massive reaction across Japanese financial markets. The Nikkei Stock Average surged 3,573 points Monday morning, representing a 5.41 percent gain and crossing the 69,000-point threshold for the first time, reaching an intraday record of 69,682 points, according to Kyodo News. The Topix index climbed 3.62 percent in parallel. This movement reflects Japan's profound exposure to energy price volatility: crude oil prices had weighed heavily on Japanese enterprises since the conflict erupted on February 28.

Falling crude prices accompanied the surge in optimism. West Texas Intermediate (WTI) futures contracts declined approximately five percent to around eighty dollars per barrel, according to News On Japan, after months of tensions that had driven up energy import costs for the resource-scarce archipelago. "Investment was stimulated by hopes that the crude oil price increases—considered a burden on Tokyo equities—would ease after the Strait of Hormuz reopened," the source reported.

The accord, announced Sunday by President Trump on his birthday, mandates immediate and permanent cessation of military operations across all fronts, including Lebanon, according to Iran's Deputy Foreign Minister Kazem Gharibabadi, cited by Japan Today. The formal signing of the memorandum of understanding is scheduled for June 19 in Switzerland, with Pakistan serving as mediator. Pakistani Prime Minister Shehbaz Sharif confirmed the agreement framework and welcomed the immediate ceasefire implementation.

Yet Tokyo approaches with measured optimism. Friction points remain in the text. Regarding transit rights through the Strait, Iran seeks to impose fees on vessels using the passage; Trump declared to the New York Times there would "never" be tolls. Furthermore, Iran's nuclear question remains unresolved: technical talks between the two nations are scheduled within sixty days following the agreement's signing, according to senior U.S. officials cited by Kyodo News. Trump himself suggested the possibility of resuming strikes if nuclear negotiations stalled.

Wataru Akiyama, strategist at Investment Content, captures the sentiment among Japanese markets: "Given the situation's numerous reversals, we must continue closely monitoring Middle Eastern developments through the June 19 agreement signing." The yen stabilized around 160.14 to the dollar in Tokyo Monday midday, as the flight to safe-haven assets partially subsided. The Nikkei's surge also surpassed the previous intraday record of 68,786 points set June 3, News On Japan reports. Outstanding questions include: the future of mine-clearing operations in the Strait—Britain and France have expressed interest—and the fate of thousands of conflict casualties, primarily in Iran and Lebanon.