While the court's decision does not mean Britain must immediately halt arms exports, it does mean there is a stay on the granting of next arms export licences to Saudi Arabia, Britain's richest Arab ally.
Wikileaks founder Julian Assange could still be detained if he leaves the Ecuador embassy in London where he sought refuge since 2012.
The High Court's ruling blocked an attempt by a former Iraqi general to bring a private prosecution against ex-British Prime Minister Tony Blair for what his lawyers described as the "crime of aggression".
Former Israeli foreign minister Tzipi Livni was approached by Scotland Yard for an interview over suspicions of Gaza war crimes. Summons were taken back after discussions between diplomats.
British court sentences two men to life in prison for plotting DAESH-inspired shootings in London
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