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An anti-Prime Minister Shinzo Abe protester attends a rally with a sign in front of Abe's official residence in Tokyo Sunday, Jan. 25, 2015. From prime minister to ordinary people, Japanese responded with shock Sunday at a video purportedly showing one of two Japanese hostages of the extremist Islamic State group had been killed. With national attention focusing on efforts to save the other hostage, 47-year-old journalist Kenji Goto, some also criticized Abe's drive for a more assertive Japan as responsible for the hostage crisis. (AP Photo/Koji Sasahara)
An anti-Prime Minister Shinzo Abe protester attends a rally with a sign in front of Abe's official residence in Tokyo Sunday, Jan. 25, 2015. From prime minister to ordinary people, Japanese responded with shock Sunday at a video purportedly showing one of two Japanese hostages of the extremist Islamic State group had been killed. With national attention focusing on efforts to save the other hostage, 47-year-old journalist Kenji Goto, some also criticized Abe's drive for a more assertive Japan as responsible for the hostage crisis. (AP Photo/Koji Sasahara)

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Fmr. diplomat: Hostage negotiations often necessary

CNN's Fred Pleitgen speaks to Former UK Ambassador Oliver Miles about the decisions that must be made when considering whether to negotiate for hostages.

Fmr. diplomat: Hostage negotiations often necessary

CNN's Fred Pleitgen speaks to Former UK Ambassador Oliver Miles about the decisions that must be made when considering whether to negotiate for hostages.