Japan’s new trade agreement might intensify political tensions in Tokyo, as Prime Minister Ishiba faces challenges

by VT Markets
/
Jul 23, 2025

Moody’s Analytics suggests the new U.S.-Japan trade deal’s immediate impact could be political. Economist Stefan Angrick remarks on its timing, noting it follows a loss for Prime Minister Ishiba’s ruling coalition in the upper house.

Ishiba is thought to have delayed the deal’s finalisation until after the election. This was possibly to maintain political unity by framing tariff threats as a national crisis. With the tariff risk now diminishing, that argument is less compelling.

Potential Leadership Change

Should Ishiba resign, his successor might have to reconsider a deal viewed as favourable to Washington. There are reports indicating that Ishiba plans to resign by the end of August. This potential leadership change raises questions about the future of the trade agreement.

Based on the political strains described by Angrick, we believe derivative traders should prepare for a significant increase in Japanese market volatility. The potential for a leadership vacuum in the world’s third-largest economy creates uncertainty that will directly impact asset prices. This is a classic environment for strategies that profit from price swings rather than a specific direction.

We expect the currency market to react first, specifically the USD/JPY pair. Historically, abrupt political changes in Tokyo cause sharp movements; when Prime Minister Shinzo Abe announced his resignation on August 28, 2020, the yen saw a surge of volatility against the dollar within hours. Traders should consider purchasing options straddles on the yen, which would profit from a large move in either direction as markets digest the implications of a new leader.

The uncertainty stemming from a potential resignation will also weigh on Japanese equities. We anticipate the Nikkei Volatility Index, a key measure of market fear, to climb from its recent average of around 17 toward its year-to-date highs above 20. Buying put options on the Nikkei 225 index is a direct way to hedge portfolios or speculate on a market downturn driven by political instability.

Market Implications

The trade deal itself puts a spotlight on specific sectors, especially Japanese automakers who were a major focus of negotiations. A successor to Ishiba might take a harder line on the deal, creating headline risk for companies like Toyota and Nissan. We would monitor options volume on these major exporters for signs of institutional hedging or bearish bets.

With reports suggesting a decision on his departure could come by the end of August, the window to position for this event is closing. The primary strategy we see is to be long volatility, as the new prime minister’s policy direction will be unknown. The risk of a successor reassessing an agreement seen as favouring Washington adds a layer of trade friction that markets have not yet priced in.

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