It's our country. We need to protect it.
For eight decades, Japan has carried the weight of a pacifist identity forged in the ashes of World War Two — a constitutional renunciation of war that became, for many, the nation's defining moral commitment. Now, facing a more assertive China, a nuclear-armed North Korea, and an American ally signaling it will no longer bear the cost of others' security, Tokyo is asking whether peace is better preserved through restraint or through readiness. Defence Minister Shinjiro Koizumi's argument — that arming Japan is the surest way to prevent it from ever having to fight — places his country at one of the most consequential crossroads in its postwar history.
- China's expanding naval presence beyond the First Island Chain and North Korea's continued ballistic missile tests have created what Japanese officials are calling a critical security moment with no clear ceiling.
- Japan has broken a fifty-year taboo by signing defence export agreements with seventeen nations, with Australian shipyards already receiving Japanese warships and the Philippines in talks to acquire destroyers.
- Prime Minister Takaichi has doubled defence spending to 2% of GDP and is pushing to amend Article 9 — the constitutional clause that has formally renounced war since 1945 — for the first time in the constitution's history.
- Critics at home argue the constitutional revision is more political theatre than military necessity, contending Japan's existing legal framework already permits the defensive operations being contemplated.
- With Washington signaling the end of subsidised allied defence, Japan is reframing its military buildup not as American pressure but as sovereign responsibility — a shift that will ultimately require approval from the Japanese public in a national referendum.
Shinjiro Koizumi, Japan's Defence Minister, sat down with the BBC in mid-June to make an argument that would have been unthinkable to most Japanese citizens a generation ago: that his country must shed the pacifist identity it has carried since 1945, not out of aggression, but as the only credible way to prevent war in an increasingly volatile region.
The transformation is already visible. For the first time in roughly fifty years, Japan has loosened restrictions on arms exports, signing defence agreements with seventeen nations including the United States, Australia, and the Philippines. Australian shipyards are receiving Japanese warships. The Philippines is in talks to acquire used destroyers. What Koizumi described as a wholesale reorientation of Japan's regional role is no longer hypothetical — it is underway.
The deeper test lies in Japan's constitution. Article 9, written in 1945, is one of the world's most explicit renunciations of military power, forbidding armed forces and the use of war to settle disputes. Prime Minister Sanae Takaichi, who took office in October 2025, is now pushing to revise it. Koizumi argued the security environment has transformed completely since the clause was written, and that Japan — which has never once amended its constitution — must adapt. The threats are real: China's military has grown more assertive around the Senkaku Islands and beyond, while North Korea continues testing ballistic missiles over Japanese territory.
Yet not everyone is convinced the constitutional change is militarily necessary. Hirohito Ogi of the Institute of Geoeconomics argued that Japan's current legal framework already permits defensive operations against China, suggesting the push to revise Article 9 is more political agenda than strategic imperative.
What is beyond dispute is the scale of the shift. Defence spending has doubled to 2% of GDP under Takaichi, funding new missiles, drones, and a broad modernization of Japan's forces. Some analysts see the potential for Japanese shipbuilders and electronics manufacturers to become serious players in the global defence market. Meanwhile, Washington has made clear — through Defence Secretary Pete Hegseth's blunt remarks at the Shangri-La Dialogue — that the era of American subsidies for allied defence is over. Koizumi absorbed the message without resentment. "It's our country," he said. "We need to protect it." Whether the Japanese public agrees will be decided, ultimately, at a national referendum.
Shinjiro Koizumi sat down in his Tokyo office to make a case that would have been unthinkable to most Japanese citizens just a generation ago: that his country needed to abandon the pacifist identity it has carried since the end of World War Two. The Defence Minister, speaking to the BBC in mid-June, was blunt about what he saw as a necessity. Japan must strengthen its military capabilities, he said, not as an act of aggression but as the only reliable way to prevent war from breaking out across a region that has grown steadily more volatile.
The shift Koizumi was describing is already underway. For the first time in roughly fifty years, Japan has begun loosening the restrictions that once made it nearly impossible to export weapons or military equipment abroad. The country has now signed formal defence agreements with seventeen nations, including the United States, the United Kingdom, Australia, and the Philippines. Australian shipyards are already receiving Japanese warships. The Philippines is in talks to acquire used destroyers from Japan's Maritime Self-Defence Force. Indonesia and New Zealand have both expressed interest in acquiring similar vessels. "This vision of trading equipment and assets throughout the Indo-Pacific is something we have never seen before," Koizumi explained, describing a wholesale reorientation of Japan's role in the region.
But the real test of Japan's willingness to remake itself lies in its constitution. Article 9, written into law in 1945, is among the world's most explicit renunciations of military power. It forbids Japan from maintaining armed forces or using war as a means of settling disputes. For eight decades, that clause has defined the nation's identity. Prime Minister Sanae Takaichi, who took office in October 2025, is now pushing to revise it. Koizumi, speaking as both defence minister and member of parliament, said the change was overdue. The security environment has transformed completely since 1945, he argued. Japan has never amended its constitution even once in that entire span. "Given how dramatically the security environment has changed, we need to adapt to those changes if Japan is to remain peaceful," he said.
The threat driving this reckoning is impossible to ignore. China has emerged as a formidable military power, and its activities in the region have grown more assertive. The Senkaku Islands, which stretch toward Taiwan and form what strategists call the First Island Chain, have long been a flashpoint. Chinese aircraft carriers have begun operating beyond these islands with increasing frequency. Japan's Defence Ministry has formally identified China's military posture as the "greatest strategic challenge" facing the nation. North Korea, meanwhile, continues to test ballistic missiles over Japanese territory, showing no signs of abandoning its nuclear ambitions. The combination has created what officials describe as a critical security moment.
Yet Koizumi insisted that Japan was not seeking confrontation. He met with his Chinese counterpart in November and expressed a desire to continue dialogue, he said. At the Shangri-La Dialogue, a major regional security forum, he reiterated that Japan remained open to communication with Beijing. "Unfortunately, there have not been many opportunities for direct communication recently," he acknowledged. "However, Japan is always open to dialogue. We will continue sending that message and hope that opportunities for dialogue can be created whenever necessary." Last month, he had pushed back against Beijing's accusation that Japan was engaging in a new militarism, arguing instead that China's "huge arsenal" was what should concern the international community.
The constitutional question remains politically delicate. Koizumi's father, Junichiro Koizumi, who served as prime minister in the early 2000s, had also supported revising Article 9. The late Shinzo Abe, who led the country more recently, became an advocate for amending the pacifist clause. But critics argue the push for constitutional change is more political than militarily necessary. Hirohito Ogi, a senior research fellow at the Institute of Geoeconomics, contended that Japan's current constitution already permits defensive operations against China. An attack on US military bases in Okinawa or Kyushu, he suggested, could be interpreted as a direct attack on Japan itself. "We don't need to amend Article 9 for defensive operations against China," Ogi said. "So it's more a political agenda than something based on military rationality."
What is undeniable is the scale of Japan's military rearmament. Prime Minister Takaichi has doubled defence spending to two percent of GDP, a historic increase from the long-standing post-war benchmark. The money is earmarked for new surface-to-ship missiles, unmanned drones deployed on land and underwater, and a broader modernization of Japan's forces. Some analysts see an opportunity for Japanese industry—particularly shipbuilding and electronic systems manufacturers—to become competitive players in the global defence market. The Center for Strategic and International Studies has noted that the emergence of true Japanese defence firms, focused primarily on military production, will be critical to the success of this transformation.
Underlying all of this is the US-Japan security alliance, which has anchored Japan's defence since the end of the war. The United States maintains roughly fifty thousand troops in Japan, the largest overseas deployment anywhere in the world. But the relationship is shifting. President Trump's administration, and Defence Secretary Pete Hegseth in particular, have made clear that the era of American subsidies for allied defence is ending. "The era of the United States subsidising the defence of wealthy nations is over," Hegseth said at the Shangri-La Dialogue last month. Japan is hearing the message. Koizumi framed Japan's military buildup not as a burden imposed by Washington but as a responsibility Japan must shoulder for itself. "It's our country," he said. "We need to protect it." The question now is whether the Japanese public, which will ultimately decide any constitutional revision through a national referendum, agrees.
Citas Notables
Given how dramatically the security environment has changed, we need to adapt to those changes if Japan is to remain peaceful.— Defence Minister Shinjiro Koizumi
We don't need to amend Article 9 for defensive operations against China. So it's more a political agenda than something based on military rationality.— Hirohito Ogi, Institute of Geoeconomics
La Conversación del Hearth Otra perspectiva de la historia
Why does Koizumi think Japan needs to abandon its pacifist stance now, after eighty years?
He's responding to a fundamentally different region. China's military has grown exponentially, and it's operating in waters Japan considers vital. North Korea keeps testing missiles over Japanese territory. The security environment of 1945 no longer exists.
But doesn't Japan's current constitution already allow it to defend itself?
Technically, yes. Some experts argue the current Article 9 is sufficient for defensive operations. But Koizumi seems to want something more—a formal recognition that Japan is a military power, not just a nation with self-defence forces. It's partly about capability, partly about identity.
What's changed about Japan's arms sales?
For fifty years, Japan was essentially locked out of the global defence market. Now it's selling warships to Australia, negotiating with the Philippines and Indonesia, talking to New Zealand. It's a complete reversal. Japan is becoming a defence exporter for the first time since the war.
Is this really about deterring China, or is it about burden-sharing with the United States?
Both, probably. The US is making it clear that wealthy allies need to spend more on their own defence. But Koizumi frames it differently—he says Japan needs to protect itself independently, not just as a US partner. The American pressure is real, but so is the Chinese threat.
What's the political risk here?
Constitutional revision requires a national referendum. The Japanese public has been deeply attached to Article 9 for generations. It's not clear they're ready to let it go, even if their government is. That's the real test.
Could this backfire with China?
Koizumi says Japan wants dialogue, and he's right that escalation serves no one. But Beijing is already accusing Japan of new militarism. Every warship sale, every budget increase, every talk of constitutional change feeds that narrative. Japan is walking a very narrow line.