Spanish officials said intelligence suggests that groups in Russia and Venezuela spread misinformation before and after Catalonia's referendum.
Venezuelan President Nicolás Maduro called for the debt-ridden country's finances to be restructured.
Venezuela and its entities already missed nearly $600 million in payments this month.
Two federal judges recently halted the latest iteration of restrictions, which broadly suspend travel for most nationals from eight countries.
The latest version of President Donald Trump's immigration restrictions has been temporarily blocked by a federal judge.
President Donald Trump said "a possible military option" might be used to deal with Venezuela.
The assembly came to power through a vote that was heavily contested by the opposition.
Venezuelan President Nicolás Maduro says he'll conduct military drills in response to Trump's threats of possible U.S. military action.
Venezuela opened its controversial constituent assembly, which has the power to rewrite the constitution. Opponents called it a power grab.
Voting technology company Smartmatic announced Wednesday the numbers were "without any doubt" manipulated by at least 1 million votes.
According to tweets from their families, Leopoldo Lopez and Antonio Ledezma were taken from their homes early Tuesday morning.
The sanctions are a reaction to a controversial vote that critics say will give Maduro power to rewrite Venezuela's constitution.