Belmarsh has frequently been used in high-profile national security cases, including that of former Finsbury Park Mosque hate preacher Abu Hamza, who now resides in a United States "supermax" prison following extradition. "Our decision is not arbitrary but is based on worldwide law".
Moreno, who became president in 2017, said his nation's previous government provided spying facilities within the embassy.
"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".
Pressed over the veracity of the allegations, Ms Robinson said: "That's not true".
Ecuador's president, Lenín Moreno, was assured by two British foreign secretaries that Julian Assange would not be extradited to a country where he could face the death penalty, according to letters seen by the Guardian.
An image tweeted by WikiLeaks on May 9, 2016, shows founder Julian Assange holding a kitten given to him by his children to keep him company where he remains holed up in the Ecuadorean Embassy in London.
Speaking to local media, Romo said Ecuador was at risk of cyber-attack, hinting Wikileaks could retaliate for the termination of Assange's asylum.
She added that Assange's fears of a USA extradition threat were proved correct this week after allegations were made that he conspired to hack into a classified Pentagon computer.
The US indictment charges Assange with "conspiracy" for working with former US Army intelligence analyst Chelsea Manning to crack a password stored on Department of Defence computers in March 2010.
Supporters of Assange protest outside the British Embassy in Washington, DC.
More than 70 MPs have also urged the Government to ensure Assange faces Swedish authorities if they request his extradition. He also has not formally responded to the U.S. conspiracy charge.
In the Guardian interview, Moreno charged that Assange "mistreated our officials (and) started to make legal threats even against who was helping him".
West met with Assange in prison on Friday.