LONDON — A London court ruled on Wednesday that Julian Assange, the WikiLeaks founder, can be extradited to Sweden for questioning over allegations of sexual abuse there last year. He will seek a final appeal to the Britain’s highest court, according to a person close to Mr. Assange

The decision was the latest chapter in a months-long legal battle that has seen Mr. Assange under house arrest and WikiLeaks temporarily shuttered. In their ruling, two British appeals judges said a European arrest warrant seeking Mr. Assange’s extradition could not “be said to be disproportionate” since it related to “serious sexual offenses,” which Mr. Assange has denied.

A British judge had previously ruled that Mr. Assange should return to Sweden to face allegations of sexual molestation, unlawful coercion and rape made by two WikiLeaks volunteers in Stockholm in August 2010. Wednesday’s ruling came after an appeal by Mr. Assange, who has engaged a series of high-profile lawyers to fight the extradition warrant.

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