President Lenin Moreno, in an interview with The Guardian, also said that Assange's activity inside the embassy violated the terms of his asylum conditions.
Robinson says Assange has had "a very hard time" since Moreno came to power in 2017.
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.
A lawyer for the Australian hacker, who remains jailed in London pending a ruling on possible extradition to the USA, has accused Ecuador of hurling "outrageous allegations" to distract from their "unlawful" abandonment of her client.
Assange is expected to fight extradition to the United States over an allegation he conspired with former army intelligence analyst Chelsea Manning to break into a classified government computer.
The Australian had spent seven years at the embassy fighting extradition to Sweden, where he is wanted over sexual assault allegations made against him. He faces extradition to the U.S. and a maximum five years in prison - assuming USA authorities don't pile on further charges once they have him in their clutches.
Jennifer Robinson told Sky News on Sunday that Ecuador is making "pretty outrageous allegations" to justify allowing British police into its embassy on Thursday in order to take Assange into custody.
That stint ended on Thursday when Ecuador revoked his asylum and he was arrested by British police.
Notre Dame’s Interior Ravaged by Flames But Cross Remains Intact
It is geographically at the heart of Paris, as it is kilometre zero. "Let us stay more united than ever, in hope". That is beyond countries, that's beyond anything. "It's a part of our culture, it's a part of our lives".
Moreno's move against Assange has proved controversial in Ecuador.
When there are competing extradition requests in the United Kingdom, the home secretary decides which country should take priority.
More than 70 MPs have also urged the Government to ensure Assange faces Swedish authorities if they request his extradition.
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.
In the affidavit submitted to federal court in Alexandria, Virginia, prosecutors said USA military reports from the wars in Afghanistan and Iraq included information about the "identity and significance of local supporters of US and allied forces in Afghanistan".
Assange, who appeared much older when he emerged from the embassy than when he sought refuge there in August 2012, has denied the Swedish rape allegation, asserting the sex was consensual. Assange traveled to Britain, where a court ruled in 2012 to extradite him to Sweden.
His next court appearance is May 2 via video link.