SEOUL, South Korea — South Korea on Friday repatriated the remains of 437 soldiers from China who were killed during the Korean War six decades ago, a sign of warming ties between the two nations.

The remains had been kept in a little-known burial ground north of Seoul, until recently called the “enemy cemetery.”

That it took six decades for the bodies of the fallen Chinese soldiers who had fought with North Korea to be returned home bore testimony to the political uneasiness rooted in a war that has never been formally ended.