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Tokyo is borrowing Kyiv's battlefield playbook to defend its southwestern islands. The drones may prove the easy part.
For decades, Japan's southwestern frontier was defended on paper by big, expensive things: destroyers, F-35s, Patriot batteries and the Marine airfield still rising from the seabed at Henoko. Russia's war in Ukraine has changed what Japanese planners count. The new unit of account is the cheap drone, bought by the tens of thousands.
Japan's 2026 Defense White Paper, adopted in August, says so plainly. It points to Ukraine, where cheap unmanned systems combined with missiles have reshaped combat, and warns that Japan must prepare for prolonged conflict. Tokyo has already put about ¥100 billion of its fiscal 2026 budget into SHIELD, a layered coastal network of aerial, surface and underwater drones due to enter service from fiscal 2027.
Nowhere will the shift matter more than in the Nansei chain, the arc of islands running from Kyushu past Okinawa to Yonaguni, barely 110 kilometres from Taiwan.
A Method, Not A Weapon
Ukraine's contribution is less a single weapon than a way of building them. More than 200 drone companies have sprung up there since 2022, refining designs in weeks rather than years. Japan, by contrast, produces only about 1,000 military drones a year, according to the Ukrainian Chamber of Commerce in Japan.
Kyiv is eager to sell that experience. During a visit to Japan at the turn of July, Foreign Minister Andrii Sybiha told NHK that Ukraine had become a world leader in drone technology and proposed joint defence projects. Japanese officials sound receptive. A Defence Ministry source told Kyodo that Japan has little drone expertise, while Ukraine has upgraded its designs again and again on the basis of combat.
Masayuki Masuda, who heads China studies at the National Institute for Defense Studies, the ministry's think tank, told the South China Morning Post that the world has watched the rules of warfare change since 2022 and that drones will carry a large share of combat on future battlefields.
From 1,000 to 80,000
The targets have moved fast. In June, the ruling Liberal Democratic Party approved a proposal to produce around 80,000 drones a year by 2030, though funding has yet to be settled. In April, Tokyo also scrapped the rule confining defence exports to five non-combat categories, removing a legal obstacle to deeper arms cooperation with Kyiv.
Industry is already pairing up. Japan's Terra Drone has teamed up with Ukraine's Amazing Drones to build interceptor drones, Japan's first investment in Ukraine's defence sector. A broader Japan–Ukraine Drone Cluster linking companies and universities launched in July. Kyodo has reported that Tokyo is weighing an arms transfer agreement to buy Ukrainian attack drones, an option officials reportedly see as less controversial than buying from Israel.
Defense Minister Shinjiro Koizumi has set the bar high. In an April post on X, he said he wants the Self-Defense Forces to become the world's most intensive user of drones and other unmanned systems.
Shield or Spear?
The Nansei chain is where Ukraine's lessons fit most naturally. It is a long line of small islands separated by open sea, the kind of theatre where Ukraine used cheap sea drones to push Russia's Black Sea Fleet away from Crimea. According to Jiji Press, SHIELD's missions include attacking enemy ships, gathering intelligence and protecting radar sites. Those are precisely the jobs of the Self-Defense Force garrisons on Yonaguni, Ishigaki and Miyako.
The islands also sit on the northern edge of the "hellscape" that US commanders want to create around Taiwan: waves of drones, missiles and artillery that would make an amphibious assault too risky to attempt. Taiwan has set up a Littoral Combat Command to put the idea into practice.
Beijing has noticed. In May, the PLA Daily accused Tokyo of a dangerous gamble in planning satellite-aided drones near Taiwan, arguing that despite its name the system is "in reality a 'spear'". In August, China's foreign ministry said it "deplores" the new white paper. Tokyo sees a coastal shield; Beijing sees the northern flank of a Taiwan war plan.
Typhoons and Nerves
The obstacles are practical before they are strategic. In January, a Ground Self-Defense Force reconnaissance drone crashed in strong wind during training in Kyushu, and the Nansei islands sit squarely in typhoon country.
Then there are the people who live there. Tokyo has rarely had a friendlier partner in Naha: Governor Genta Koja, elected in September, is dismantling the prefectural office that spent a decade fighting the Henoko airfield. On the outer islands the mood is more divided. Yonaguni's mayor, Kenichi Itokazu, has campaigned for more troops for decades. Yet a government plan to evacuate 120,000 residents of the remote islands would take at least six days, and some islanders doubt it would work at all. "We are on a remote island, and we cannot simply drive to another prefecture if something happens," said Kenji Sato, 47, a Yonaguni resident. He fears Yonaguni "could become more strategically important in a conflict, while the people living here have very little control over those decisions."
Unease is already gathering around electronic warfare, the main counter to drones. When the Defense Ministry briefed Yonaguni on an anti-air electronic warfare unit due to deploy this fiscal year, about 100 residents turned out and voiced fears of being drawn into a war, according to the Ryukyu Shimpo.
Takeshi Nakamura, a 45-year-old Ishigaki resident, worries less about deterrence than about details no one has explained. "If there is a technical failure or an accident, who will be responsible?" he asked in an interview with the author. He says he has seen no detailed briefing on where the drones would be stored or how close to homes they would operate. Ukraine weighs on him too. The war, he said, "has shown that places far from the front lines can also be affected by drone attacks."
Drones fit awkwardly into Okinawa's old base debate. They need no runways or landfill, so they generate fewer of the noise and environmental complaints that dogged Henoko. But they turn every island with a launch site into a target.
Two lessons from one war
Ukraine teaches two lessons at once. Cheap mass can blunt a far larger military. And a war fought with cheap mass tends to be long, attritional and close to where people live. Okinawans, who by common estimates lost about a quarter of their population in the 1945 battle for the island, need no drone war to grasp the second point.
Tokyo has clearly absorbed the first. "If we just keep the conventional way of combat, we'll be left behind," a senior Defense Ministry official told Jiji. Whether it has absorbed the second will be decided not in Kyiv or Tokyo but on Yonaguni, Ishigaki and Miyako.
For Okinawa, the question is whether SHIELD eases the shadow of the bases or simply casts a new one. Sato, on Yonaguni, puts it plainly: "We should not be expected to accept every new military installation without asking difficult questions."
***Alan Callow is a graduate of Western Mindanao State University in the Philippines and is a freelance journalist with experience in writing about the Asia-Pacific region.***
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