The 47-year-old Australian national, who has been holed up in a back room of the Ecuadorean embassy in central London for over six years, was placed under a new set of house rules after he was allowed limited internet access recently after a seven-month hiatus.
The case, which is being launched in Ecuador by Wikileaks lawyer Baltasar Garzon, is expected to be heard in a domestic court next week.
"Ecuador's measures against Julian Assange have been widely condemned by the human rights community", it added.
The move to start legal proceedings comes just days after Ecuador issued Assange with a list of rules to obey if he wanted to continue living in the embassy. The embassy cut Assange's internet access in 2018 following his comments on the Skripal poisoning case.
If the prosecution in Sweden against Assange were dropped in may 2017, a british court has reiterated in mid-February with his refusal to lift his arrest warrant on the grounds that it had not met in 2012, the conditions of his bail. "The protocol is in line with worldwide standards and Ecuadorean law", he told reporters.
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However, Meghan missed the Invictus cycling medal presentation in Sydney's Domain this morning amid speculation over her health. Over 16 days they are travelling to Australia, Fiji, Tonga and New Zealand , with a packed programme of over 70 engagements.
In a statement, Wikileaks questioned the legality of the "Special Protocol" laid out to Assange by Ecuador, which was reported earlier this week and "makes Assange's political asylum contingent on censoring his freedom of opinion, speech, and association".
Russian diplomats called the story "fake news", but the files show Assange was briefly named "political counsellor" to the Ecuadorean Embassy in Moscow with a monthly salary pegged at $2000.
WikiLeaks founder Julian Assange coming out on the balcony of the Ecuadorean embassy.
Valencia said on Friday that Ecuador would "respond in an appropriate manner, in respect of the law". "The embassy has the right to protect its offices, the officials who work there, and even Mr. Assange himself", he wrote.
The WikiLeaks founder says he fears extradition to the United States for questioning over the activities of the website if he leaves the building in leafy Knightsbridge.