Whelan, who holds US, British, Canadian and Irish passports, was detained in Moscow on December 28.
Russia's FSB security service has asked a Moscow court to extend the detention of former US marine Paul Whelan who is being held on suspicion of spying, the Interfax news agency reports.
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Whelan - who holds US, British, Canadian and Irish passports - was detained in a Moscow hotel room on December 28.
He denies the charges against him.
The court ruled in late December that Whelan should be held in custody until February 28, the agency reported.
The FBS wants to extend this to May 28.
Australian Associated Press
