MORE than most countries, Japan has long wished to remain divorced from the world’s worries, which seldom reach its shores (the last terrorist attack, in 1995, was home-grown). So the news that Islamic State (IS) had murdered a second Japanese hostage, Kenji Goto, brought anguish to many. It also shone a light on the foreign-policy ambitions of the prime minister, Shinzo Abe. Mr Goto, a noted war
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