Venezuela's move comes after EU foreign ministers agreed to sanction 19 Venezuelan officials a day earlier.
Secretary of State Mike Pompeo announced the step, citing in particular Cuba’s continued harbouring of US fugitives as well as its support for Venezuelan leader Nicolas Maduro.
Guaido boycotted the December 6 polls, losing the limited institutional legitimacy he had and leaving foreign governments backing his claim to the presidency in a difficult position.
Electoral board president says 67.6 percent of 5.2 million votes cast in Sunday's election were for pro-Maduro candidates with only 31 percent voter turnout.
An opposition coalition led by US-backed politician Juan Guaido is boycotting the vote and will hold a referendum over several days after the election.
Opposition leader Juan Guaido urges military leadership to join a "unity pact" of opposition forces to block the holding of December 6 legislative elections in a bid to pressurise President Nicolas Maduro.
President Nicolas Maduro also pardoned dozens of lawmakers of opposition leader Juan Guaido who have been accused of conspiring against his government, as the country heads toward parliamentary elections scheduled for December.
A judge in London has said the British government had "unequivocally recognised" opposition leader Juan Guaido as Venezuela's president, in a battle over gold bullion held at the Bank of England.
Candidates will contest an expanded number of seats in the new legislature, which will increase from 167 to 277, said Indira Alfonzo, the president of the recently appointed National Electoral Council announced.
Relations have been tense since 2017 when Venezuela became the first Latin American country to receive sanctions from the EU, including an arms embargo.
US President Donald Trump on the other hand appears to have walked back on comments that he would consider meeting his Venezuelan counterpart Nicolas Maduro
Former US national security adviser John Bolton in his book has accused President Trump of seeking help from China for a win in 2020 presidential elections. The White House asked a federal court for a restraining order against its release.
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