Julian Assange's fiancee Stella Moris on Monday said a UK court decision to block the WikiLeaks founder's extradition to the United States was "the first step towards justice in this case".

Moris, who has two young sons with the Australian, said the ruling was "a victory" but she would not celebrate until he was free and also appealed to US President Donald Trump.

"End this now," she said outside the Old Bailey court in central London. "Tear down these prison walls, that our little boys have their father, for Julian, the press, for all of us."

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