Tsushima, halfway between Japan and South Korea, is about as close as you can get to the frontline of their trade war. Now part of Nagasaki Prefecture, waves of Korean cultural, commercial and military influence have crested and receded over the hills of this verdant island since the Middle Ages.

Here it’s apparent that centuries-old ties between the nations can’t be unwound by political rhetoric spewing from distant capital cities. Economic life crawls along, with a determination to do whatever it takes to weather this moment in Seoul-Tokyo relations. Survival depends on it.

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