Venezuela’s Supreme Court has banned opposition leader Juan Guaidó from leaving the country and frozen his bank accounts.
The move comes amid an escalating power struggle, after Mr Guaidó declared himself interim president last week.
He has been backed by the US and other countries. President Nicolás Maduro has major allies too, including Russia.
The opposition has asked supporters to take part in a two-hour peaceful protest on Wednesday.
It is as yet unclear if Mr Guaidó will attend.
A group of North and South American countries has meanwhile opposed any outside military involvement in the country.
Peru’s foreign minister Nestor Popolizio said the Lima Group – a 14-country body including Canada set up in 2017 to find a peaceful solution to the crisis in Venezuela – was opposed to “military intervention”.
US officials have stated that all options to resolve the crisis “are on the table”.
Meanwhile, in an interview with Russian state news agency RIA, Mr Maduro reiterated that he is ready for talks with the opposition “for the sake of peace and its future”, and asked for help from international mediators.
Venezuela has been facing acute economic problems and there has been an upsurge in violence in recent weeks.