Japan’s economy has been under strain since the energy shock three years ago, and a fresh political reset has not eased the pressure. Remarks by the new prime minister on Taiwan triggered a swift response from Beijing. China has rolled out broad based export controls on any goods that could have military applications, effectively cutting off a wide swathe of dual use inputs. Markets took fright, and the message from Beijing is that the scope can widen as needed.

The squeeze touches roughly 800 items, from chemicals and electronics to sensors and equipment used in shipping and aerospace. The timing is painful for Japan. In 2024 it imported about 167 billion dollars worth of goods from China, or roughly 22.5 percent of total imports, including 48 billion in electrical and electronics and 30 billion in industrial materials and machinery. Losing access to even a slice of these inputs would push costs higher, dent output, and make both domestic goods and exports less affordable.

The dependence is asymmetric. China’s total trade exposure to Japan is near 5 percent, while Japan’s exposure to China is closer to 20 percent. If Beijing escalates to import bans on Japanese goods, autos and electronics would be in the firing line. The bigger near term risk is rare earths. Around 72 percent of Japan’s rare earth imports come from China, alternatives are limited and more costly, and new refining capacity is hard to build. A three month disruption could shave about 660 billion yen from income, or roughly 0.11 percent of GDP, and a year long cut could tip the economy into recession.

All this lands on a fragile macro backdrop. The yen is still down about a third against the dollar since 2021. Multiple currency interventions and rate hikes have not restored confidence. Bond markets are flashing stress, with the 30 year yield around 3.52 percent and the 10 year at a multi decade high above 2.1 percent. Higher borrowing costs, sticky inflation and a weak currency risk a feedback loop. With debt well over 200 percent of GDP, more bond buying by the central bank risks stoking inflation rather than soothing it.

China is also pushing for greater self sufficiency in chips and key materials, including a new anti dumping probe into a semiconductor input where Japan is a leader. That shift reduces Japan’s leverage over time. Exports to the United States and Europe have risen, but sales to China have slipped, and tourism has not offset the drag.

The practical takeaway is that Tokyo may need to recalibrate its stance to limit economic damage. The downside of a prolonged dispute looks large, given China’s control over critical inputs and its industrial scale, while the immediate upside for Japan is hard to see.