The UK is extending diplomatic protection to a British-Iranian woman imprisoned in Iran.
Nazanin Zaghari-Ratcliffe was jailed in Iran for five years in 2016 on spying charges she denies.
London's move on diplomatic protection means her case will become a legal dispute between Britain and Tehran.
Iran says the decision 'contravenes international law'.
Retired British diplomat Peter Ricketts says it gives the UK more options to escalate the case with the international community.
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