Japan has taken one of its biggest steps away from its long-standing post-war military restraint. The country’s cabinet has approved a record defense budget that reflects growing fear of conflict in East Asia, increasing concern over China, and a belief that Japan must be ready to defend itself and support its allies if a crisis erupts.

Japan approved a defense budget of more than ¥9 trillion, equal to about $58 billion, for the next fiscal year beginning in April. This represents a 9.4 percent increase from the previous year’s budget and marks the fourth year in Japan’s five-year plan to double defense spending to 2 percent of its gross domestic product.

This level of spending is historic. For decades after World War II, Japan kept military spending low and focused more on diplomacy, economic strength, and its security partnership with the United States. Even during the Cold War, defense was not a top spending priority. As recently as 2021, Japan’s defense budget was far lower, and spending increases were more gradual. Now Japan is accelerating, planning to hit its 2 percent target by March, two years earlier than originally promised.

What the New Budget Will Pay For

The new defense plan is centered on strengthening Japan’s ability to defend itself quickly and powerfully if attacked. Japan is investing in long-range strike-back capabilities, cruise missiles, and new coastal defense systems. Surface-to-ship missiles will be expanded, along with modernized missile regiments.

A major new effort involves unmanned technology. Japan plans to deploy “massive” unmanned air, sea, and underwater drones for surveillance and coastal protection under a project called “Shield,” which is expected to be fully operational by 2028. Drones are also seen as a solution to Japan’s manpower shortages. To speed up deployment, Japan may import some advanced systems from partners such as Turkey and Israel.

Defense Minister Shinjiro Koizumi said the spending level represents “the minimum needed” because Japan faces “the severest and most complex security environment in the postwar era.”

What is Driving Japan

Japan’s change is driven mainly by anxiety over China. Tokyo now officially labels China as its greatest security challenge. Relations took a sharp turn downward when Prime Minister Sanae Takaichi said Japan would probably get involved if China attacked Taiwan. China reacted furiously with diplomatic pressure and economic retaliation. Japan refused to back down, insisting its basic defense policies had not changed but also signaling it would not ignore a threat to Taiwan.

China’s behavior has continued to raise alarms. Its military has been modernizing for years with the clear goal of gaining the ability to seize Taiwan by force. Chinese naval and air operations are expanding farther beyond China’s borders. Earlier this month, Chinese aircraft locked targeting radar on Japanese jets during drills near southwestern Japan. Radar locking is considered extremely dangerous because it signals readiness to fire, forcing the other aircraft to respond defensively.

China has also accused Japan of helping create a “space arms race,” criticizing Japan’s growing cooperation with the United States on space and defense technology. Chinese officials have even warned about the risk of a “Pearl Harbor scenario,” using emotionally charged historical language meant to alarm the region.

China claims its military spending is “reasonable and moderate,” calling its actions legal and defensive. At the same time, Beijing strongly attacks both Japan and the United States for supporting Taiwan. The United States recently approved more than $10 billion in arms sales to Taiwan and passed legislation authorizing even more cooperation in 2026. China says the United States is encouraging Taiwan’s independence movement and threatening peace.

But from Japan’s perspective, standing still feels dangerous. Taiwan is geographically close, and any conflict there could threaten Japan directly. Japan’s constitution once strictly banned military action abroad, but a 2015 amendment allows collective self-defense in limited cases. Now, with Chinese warships, aircraft, and military exercises pressing closer, Japan believes it must prepare for the worst.

Japan’s decision marks a dramatic shift from its post-war pacifist identity. What began as slow, careful increases in funding has now become a determined buildup. Japan is moving rapidly toward a stronger, more assertive military posture, closer coordination with the United States, and a willingness to engage if regional conflict erupts.

Many in Japan support the move, believing peace is best protected through strength. Others worry the region is drifting toward an arms race that could make war more likely. But one fact is now clear. Japan no longer sees security as something guaranteed by distance or diplomacy alone. In its leaders’ eyes, the world has changed, China has changed, and Japan must change with it.