Japanese Politics Updates – May 17, 2026

This Week in Japanese History: Echos of Anpo (1960)

The briefing opened with reflection on the Anpo protests against the revised US-Japan Security Treaty… 66 years ago. Hundreds of thousands surrounded the Diet fearing Japan was becoming too deeply entangled in American Cold War strategy. The unrest extended well beyond the Diet itself, with major university campuses becoming centers of prolonged confrontation. Prime Minister Kishi ultimately forced the treaty through parliament amid extraordinary political turmoil, permanently shaping postwar attitudes toward alliance management, constitutional identity, and fears of external entanglement. 

What made the historical reference particularly relevant this week was the degree to which many of the same anxieties still linger beneath current debates surrounding Taiwan, defense normalization, and the future role of the US alliance itself.

The Prime Minister’s Week: Politics, Not Just Policy

A major theme this week was not just the Trump–Xi meeting, but Prime Minister Sanae Takaichi’s increasing focus on internal political management inside the LDP.

After criticism that she had become overly insulated within the Kantei and too narrowly focused on policy execution, the Prime Minister spent much of the week holding factional consultations, lunches, dinners, and political coordination meetings with senior party figures. Friday’s high-profile steak lunch included Taro Aso, Secretary-General Suzuki Shunichi, Hagiuda Koichi, and Kajiyama Hiroshi, with discussions centering on Hormuz, supplemental budgeting, and broader party coordination.

Attention is now turning toward the inaugural gathering of “Kokuryoku” (“National Power”) scheduled for May 21 — a new pro-Takaichi support group assembled under the guidance of Taro Aso. Importantly, it is not a faction, but rather a support network intended to reinforce the Prime Minister’s political durability inside the LDP.

Particularly noteworthy is the expected participation of US Ambassador George Glass as guest speaker. In Japanese politics, presence itself often carries meaning. Equally revealing are several expected absences: Kono Taro, Hayashi Yoshimasa, and other potential future leadership contenders appear to be maintaining some distance from the emerging Takaichi-Aso alignment.

The overall impression this week was that the Prime Minister has begun shifting from governing administratively toward governing politically.

Trump, Xi, and Tokyo’s Anxiety About “G2”

Tokyo watched President Trump’s Beijing visit carefully.

While the Takaichi government reportedly hoped Trump might stop in Tokyo before traveling to China, the administration instead dispatched Treasury Secretary Scott Bessent to Japan. Trump then called Takaichi directly while still in the region, reaffirming the “unwavering” nature of the US-Japan alliance while discussing Taiwan, Hormuz, and economic security.

Still, concern persists in Tokyo, and similarly in Seoul and Taipei that Washington and Beijing may begin managing regional tensions more directly between themselves.

The deeper concern in Tokyo is less abandonment than marginalization. That concern appears to be accelerating Japan-South Korea coordination. Prime Minister Takaichi will travel to South Korea Tuesday for two days of expanded bilateral discussions as the “2+2” framework continues gaining momentum and producing results.

The Yen, Intervention, and the BOJ’s Dilemma

The yen closed the week at ¥158.46 to the dollar, continuing its gradual weakening following the Golden Week interventions.

Considerable discussion focused on how Japan finances such interventions. The Ministry of Finance does not simply “print money” to support the yen. Instead, it sells portions of Japan’s enormous foreign reserve holdings estimated at roughly $1.2 trillion, including US Treasury securities and other foreign-denominated assets accumulated over decades through trade surpluses and export earnings: this last intervention totalled ~US$10 billion.

The objective appears less about restoring the yen to previous levels than preventing excessive volatility and avoiding a psychologically damaging breach beyond ¥160.

Meanwhile:

• inflation remains sticky, 
• bond yields continue rising, 
• and pressure on the BOJ is intensifying. 

Secretary Bessent reportedly delivered pointed warnings regarding yen weakness, fiscal expansion, and delayed monetary normalization.

Tokyo now appears trapped between:

• weak currency pressure, 
• rising borrowing costs, 
• and persistent inflation. 

None of these are likely to ease quickly.

Energy Security and Japan’s Gradual Adaptation

Despite continuing tensions surrounding Hormuz, Japan’s energy logistics system appears to be functioning more effectively than many had expected.

Additional supertankers reportedly reached Japan this week, with others still inbound, including:

• Idemitsu-linked shipments, 
• UAE-rerouted cargoes, 
• and Sakhalin-related deliveries operating under existing LNG carve-out exemptions. 

The arrivals helped stabilize refinery expectations, energy markets, and supply-chain confidence at a moment when global energy markets remain highly sensitive.

One small but revealing detail discussed during the briefing involved Japanese manufacturers quietly reducing heavy color printing on plastic packaging in order to conserve petrochemical feedstocks. It was presented as a very Japanese form of adaptation: incremental, quiet, and yet rapidly implemented across supply chains.

Politics Inside the Diet

Following Golden Week, the Diet returned to full speed. Constitutional revision, retrial reform, imperial succession, defense expansion, and supplemental fiscal policy are all now moving simultaneously through the political system.

The retrial legislation has generated controversy because critics argue portions could strengthen prosecutorial leverage and make retrials more difficult under certain circumstances. Imperial succession discussions also intensified again this week. The unresolved issues remain whether female imperial family members may retain imperial status after marriage, and whether descendants of former cadet branches removed after World War II might somehow be reincorporated into the imperial household in order to preserve traditional male-line succession: consensus still does not exist.

Meanwhile, the weekly magazine Bunshun again emerged as an important political actor. Recent reporting focused negatively on Takaichi’s internal political methods, alleged SNS campaign coordination, and personal details regarding life inside the Kantei. The briefing noted that sustained follow-up reporting from Bunshun would signal something larger than a one-week controversy and potentially trigger a prolonged political confrontation.

That also helps explain why senior LDP figures are now moving to visibly consolidate support around the Prime Minister.

Defense and Strategic Normalization

The LDP’s National Security Committee spent much of the week discussing future defense spending levels and expanded drone capabilities. Some party hawks are now openly discussing defense expenditures reaching 3–3.5% of GDP, well beyond Japan’s current trajectory.

Debate also continues regarding how directly future security documents should characterize China as a strategic threat.

Japan additionally endorsed a multinational Hormuz security mission statement this week, although Defense Minister Koizumi was careful to clarify that this does not automatically imply direct Japanese military participation.

Still, the broader pattern is now difficult to miss: Japan continues normalizing strategic thinking steadily, incrementally, and with growing public acceptance.

Questions Raised During the Q&A

• In view of the Trump-Xi summit, should Japan expect substantially greater Taiwanese corporate investment and second-home purchases by Taiwanese nationals? 
• Could the fallout from the Trump-Xi meeting accelerate defense cooperation among Japan, South Korea, and the Philippines? 
• When Japan intervenes to support the yen, where exactly do the financial resources come from? 
• How vulnerable is Japan’s financial position if large-scale interventions continue? 
• Does the OECD’s suggestion that Japan may eventually require consumption tax increases toward 15–20% reflect unavoidable demographic and fiscal realities? 
• Are younger Japanese voters gradually shifting toward smaller, social-media-savvy political parties? 
• Why is Prime Minister Takaichi herself reportedly absent from the initial Kokuryoku organizational meeting? 

Closing Observation

Japan appears increasingly aware of the strategic environment now emerging around it and is maneuvering carefully to adapt. The government is simultaneously attempting to stabilize the yen, maintain alliance credibility, strengthen defense preparedness, manage energy insecurity, and preserve room for strategic autonomy. None of those balancing acts are simple and easy.

But this week suggested a government and political system that, while imperfect and often incremental, is moving with greater intention than drift.