She added she feared for threats to Assange's life from third-party states.
Assange, who has not left his cramped accommodation in fear of arrest by British authorities, has responded to the news by posting an image on Twitter wearing the Ecuadorian national soccer team's shirt.
News of his naturalization comes a day after he it was revealed he had been given an Ecuadorian passport.
Assange, 46, has been living in the London embassy of the south American country for five-and-a-half years after being granted political asylum as he fought sex-related claims in Sweden.
Hours before Ecuador's announcement, Britain said it had rejected a request by Ecuador to grant Assange diplomatic immunity so that he could leave the embassy.
"There are well-founded fears we have about possible risks to his life and integrity, not necessarily by the United Kingdom but by third party states".
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Pierce County deputy was Navy veteran, father
A burglary investigation that began Sunday night southwest of Tacoma ended with the death of a Pierce County Sheriff's Deputy. Bethel School District canceled all classes for Monday out of "an abundance of caution", it reported on its Facebook page.
A spokeswoman for the British Foreign Office said that from its perspective: "He is free to leave the Ecuadorean embassy whenever he wants".
However, UK police say he will be arrested if he leaves the embassy in Knightsbridge for failing to surrender to the court in 2012. He fears that if arrested by UK authorities they he will be extradited to the United States whose government is looking to prosecute Assange for publishing thousands of USA classified military and diplomatic documents via his Wikileaks page.
The anti-secrecy group's chief has been based at the Ecuador embassy in central London since 2012 after he lost appeals against sexual assault charges in Sweden.
Assange's legal team this week reiterated its demand that London abide by the United Nations ruling declaring him to be unlawfully and arbitrarily detained and calling for him to be freed and compensated.
Ecuador remains willing to shield Assange from any possible extradition for the immediate future but has no way of extracting him without London police interference, hence the impasse.
Prosecutors there dropped the allegations in May 2017.
"A person can not live in those conditions forever", she added, reiterating that Ecuador will continue to provide the whistleblower with all necessary assistance. The US attorney general, Jeff Sessions, said last May that Assange's arrest was now a "priority".
Pink to sing National Anthem at the Super Bowl 2018
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Kia Niro EV: Is It More Techy Than Motory?
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