US president Donald Trump did not elaborate on when or how such a blockade could be imposed.
Opposition leader Juan Guaido did not specify a date for resumption of talks at the new venue, in the Caribbean, after earlier discussions stalled in Norway.
Venezuelan officials say they have foiled a plot to overthrow the government that included assassinating President Nicolas Maduro and his closest political allies.
UN human rights chief Michelle Bachelet, who arrived in Caracas on Wednesday for a three-day visit, has held talks with Venezuelan President Nicolas Maduro and the opposition leader Juan Guaido.
The State Department said the United States will no longer permit visits to Cuba via passenger and recreational vessels, including cruise ships and yachts, as well as private and corporate aircraft.
Colombian President Ivan Duque arrived in Lima during a state visit to Peru amid discussions on migration. Duque was greeted by an honour guard upon his arrival at the presidential palace.
Juan Guaido on Tuesday at 4AM, flanked by soldiers who had deserted the Venezuelan army, attempted what looked like one last roll of the dice in his bid to overthrow the Maduro government.
The prolonged political deadlock in Venezuela needs to be settled so the country can begin the road to recovery.
The International Federation of Red Cross confirmed that medicine and supplies to treat patients landed in Caracas after Venezuelan President Nicolas Maduro’s government gave approval.
US Secretary of State Mike Pompeo and Colombian President Ivan Duque have visited a migrant shelter hosting Venezuelans in the border town of Cucuta.
"Twenty-eight hospitals and eight primary health centres in Venezuela will benefit from training, water and sanitation and medical materials supplied by the ICRC," the independent aid agency says.
US and dozens of other countries recognise opposition leader Juan Guaido as oil-rich country's interim leader against President Nicolas Maduro, who refuses to step down and accuses Guaido of being a US puppet.
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