Families of victims of the Khmer Rouge regime broke down in tears as two top leaders were sentenced to life in prison for crimes against humanity.
At least two million people are thought to have died between 1975-79 during the regime's rule.
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The former foreign minister said that Parliament should be willing to reject a deal that is not in the UK's best interests.
The country's top defence officer said the force may ignore any order to launch a nuclear attack which is deemed to be illegal.
Navy officials say they have received seven short satellite calls which are though to have come from the submarine.