The border between Armenia and Turkey has been closed since 1993, a mini Iron Curtain that is in part a legacy of one of the world’s more rancorous conflicts, nearly a century old. Recent weeks have brought news of a possible thaw, with the two countries outlining a plan for establishing diplomatic ties and lifting barriers....

But first, most insisted, Turkey must address the past.

They said that before negotiations proceeded, the Turkish government must acknowledge that 1.5 million ethnic Armenians were systematically killed under Ottoman rule in Turkey during World War I.