The letters, which are virtually identical, read: "You have expressed concern that, should Julian Assange be extradited from the United Kingdom, there would be a risk that he could be subject to the death penalty".
"I think the first thing to say is Ecuador has been making some pretty outrageous allegations over the past few days to justify what was an unlawful and extraordinary act in allowing British police to come inside an embassy", she said on Sky's Sophy Ridge On Sunday.
Ecuador's interior minister, Maria Paula Romo, said they had identified a "key member of WikiLeaks" who was "close to Mr Julian Assange".
President Moreno of Ecuador said in an interview that Assange had "bothered and threatened guards; [and] hit and mistreated employees of the embassy".
Assange was arrested and carried out of Ecuador's embassy in London on Thursday after President Lenin Moreno removed his diplomatic protection following seven years of self-imposed exile in the building.
But that same year, Swedish authorities issued an arrest warrant for Assange over two allegations of sexual assault, which he has always denied (Swedish authorities later dropped the investigations). Sweden is considering reviving the investigation.
She added that Assange's fears of a United States extradition threat were proved correct this week after allegations were made that he conspired to hack into a classified Pentagon computer.
Last series of 'Game of Thrones' promises to thrill
So how will you watch it? Otherwise, viewers will be forced to wait until Monday to stream the episode either On Demand, on Hulu. At the same time, we are sad that this will be the last time when we witness the entire cast reunite for the show.
Ecuador's Moreno ended Assange's protected status after more than 6½ years and opened the way for his arrest.
On Saturday, an Ecuadorean judge ordered a Swedish citizen close to Assange jailed pending trial for alleged involvement in hacking government computer systems. More than 70 British legislators have urged Javid to give priority to a case involving rape allegations ahead of the USA request.
He would not be expected to enter a plea to the Department of Justice case unless he loses his extradition case and is brought to a courtroom in the US.
He has not formally responded to the US conspiracy charge.
In a video announcement after Assange's arrest, Moreno accused Assange of "discourteous and aggressive behaviour" inside the embassy, and said that WikiLeaks made "hostile and threatening declarations" during Assange's time in the embassy.
El Pais said in its article that Assange had been granted permission by the embassy in 2012 to use recording equipment in order to work out who was throwing objects at his window in the early hours of the morning. This is also the same district where the U.S. Attorney's Office mistakenly named Assange as a target of yet-to-be unsealed criminal charges. Assange traveled to Britain, where a court ruled in 2012 to extradite him to Sweden.