The statement said: "A threat of this nature is a hostile and extreme act, which is not proportionate to circumstances and an unprecedented assault on the rights of asylum seekers worldwide.
"We draw attention to the fact that the United Nations General Assembly has unanimously declared in Resolution 2312 (1967) that 'the grant of asylum is a peaceful and humanitarian act and that, as such, it cannot be regarded as unfriendly by any other State'."
The website noted that Assange had not been charged with any crime in any country.
The statement added: "We note with interest that this development coincides with the UK Secretary of State William Hague's assumption of executive responsibilities during the vacation of the Prime Minister and Deputy Prime Minister".
Assange had taken shelter in the Ecuadorian embassy in June defying a British police order to turn himself in for extradition to Sweden.
The whistleblower, who invited the wrath of the United States after publishing secret diplomatic cables, has maintained that the allegations of sexual offences against him were politically motivated.
The former computer hacker has expressed apprehension that he would eventually be extradited to the US, where he could be tried for espionage.
WikiLeaks published over 2,50,000 confidential US diplomatic cables in 2010 that included information on the wars in Iraq and Afghanistan.
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