Sweden has submitted a formal request to interview Julian Assange inside the Ecuadorian embassy in London over allegations of a sex attack.
The Wikileaks founder has been hiding out in the embassy for more than four years to avoid extradition to Sweden for questioning over the alleged offence, which he denies.
Ecuador confirmed that it was considering the request and will respond as soon as possible.
Mr Assange has long argued that he should be interviewed inside the embassy, a route Sweden had previously rejected.
He claims that an extradition could lead to him then being handed over to the US to face questions about his role in Wikileaks.
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Lawyers for Julian Assange have asked a court in Sweden to overturn an international arrest warrant for the WikiLeaks founder, who is wanted for questioning in relation to an allegation of rape.
Assange has lived in the Ecuadorian embassy in London since June 2012 after being granted asylum.
It follows a recent ruling by a United Nations panel that his ongoing stay at the embassy amounts to "arbitrary detention".
"We consider that there have arisen a number of new circumstances which mean there is reason to review the earlier decision," Thomas Olsson, one of Assange's lawyers said.
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Emerging onto the balcony of the Ecuadorian Embassy this evening, Julian Assange was holding a copy of the UN tribunal ruling in his favour.
But he still cannot step foot outside the building without being arrested as a warrant remains in place.
Assange's supporters say Britain, Sweden and the USA are complicit in a strategy to ultimately send the Wikileaks founder to America to face investigations for leaking embarrassing State secrets.
ITV News Correspondent, Paul Davies reports:
Wikileaks founder Julian Assange has described a UN ruling, that he has been arbitrarily detained by the UK and Sweden, as a "victory" for himself and the "independence of the UN.
Appearing on the balcony of the Ecuadorian embassy in London, he said that the UN ruling is "legally binding" in response to comments from the Foreign Secretary that he remains a "fugitive of justice".
He added that neither Sweden nor the UK have appealed the decision.
"Having been involved in the exposure in the corruption and war crimes in government for nearly 20 years, it doesn't come as a shock to see the type of injustice that I've been in the business of exposing inflicted on [myself]," he said.
How sweet it is, this is a victory that cannot be denied. It is a victory of historical importance, not just for me, for my family, for my children but the independence of the UN system.
I'm tough, I'm hardened by this process and I can take it. However, what right does this government or the US government or the Swedish government have to deny my children their father for five and a half years without any charges in any country? That is a fact I will never forget.
The Ecuadorian government has demanded WikiLeaks founder Julian Assange be allowed to go free from its London embassy after a UN panel ruled in his favour.
Foreign minister Ricardo Patino said the ruling, which stated Mr Assange has been arbitrarily detained by the UK and Sweden, left both countries with no option but to accept the panel's report, which is not legally binding.
"What more do they want to be accused of before they start to rectify their error?" he told South American broadcaster Telesur.
Mr Patino said Ecuador was analysing its next steps over Mr Assange, who has hailed the ruling as a "significant victory".
Both the UK and Sweden deny Mr Assange has been deprived of his freedom while Swedish prosecutors said the UN panel's decision had no formal impact on its rape investigation against the Australian whistleblower under Swedish law.
WikiLeaks founder Julian Assange hailed the UN working group's ruling that he has been deprived his liberty by the UK and Sweden as "a really significant victory that has brought a smile to my face".
Addressing reporters at a press conference via video from inside the Ecuadorian embassy, Mr Assange said the ruling in his favour is the "end of the road" for the legal arguments put forward by the two countries.
"Put simply, those arguments lost," Mr Assange said. "There is no appeal. The time for appeal is over."
He attacked the Foreign Office's rejection of the panel's decision as insulting and said it was a matter for the UN to enforce its decisions.