Assange has also been accused of using his anti-secrecy website to collaborate with Russian Federation and President Donald Trump in influencing the 2016 USA presidential election, a charge that all three parties deny.
In November, WikiLeaks suggested that the USA authorities might have brought sealed charges against Assange, citing a filing in an unrelated case that used Assange's name in an "apparent cut-and-paste error".
"There is a path for Mr. Assange to take the decision to exit into near freedom".
Moreno, however, said Britain guaranteed that Assange would not be extradited to a country where his life is in danger.
The whistleblower has been living in the Ecuadorian embassy since 2012.
The latest development means that if federal prosecutors do choose to go after Assange, they would have to assure the United Kingdom that they would not pursue the death penalty.
Federal criminal charges against Assange have been filed secretly in the USA and were accidentally leaked in a court filing for an unrelated case several weeks ago. He has been staying in the embassy amid the fear of being extradited to the United States if he attempted to leave.
Assange entered the embassy after two years of battling an extradition to Sweden to be questioned by prosecutors, who were considering whether charges should be brought against Assange for sexual assault.
There is speculation that the U.S. interest in Assange is connected to the investigation by Special Counsel Robert Mueller into Russian interference in the 2016 election that brought President Donald Trump to office.
Mr Assange founded WikiLeaks in 2006.
Mueller charged 12 Russian spies in July with conspiring to hack the Democratic National Committee in an effort to sway the election. Transmitting defense information to be used for injuring the United States can be punishable by death.
His lawyer, Carlos Poveda, said last month that Assange was prepared to give himself up to British police provided he receives assurances he would not be extradited.
Ecuador s foreign minister Jose Valencia said at the time that Britain was merely asking him to appear in court to answer for having broken his bail conditions, and that he was likely to get a sentence of no more than six months.
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