Guaido is now petitioning the Bank of England to prevent Mr Maduro getting his hands on $1.3 billion (£1 billion) in gold held in London vaults.
They are the toughest U.S. financial challenge yet to Venezuela's embattled socialist president, Nicolas Maduro.
"My advice to bankers, brokers, traders, facilitators, and other businesses: don't deal in gold, oil, or other Venezuelan commodities being stolen from the Venezuelan people by the Maduro mafia".
Secretary of State Mike Pompeo stressed that the new sanctions do not target the people of Venezuela and will not affect humanitarian assistance, including medicine and medical devices that are "desperately needed after years of economic destruction under Maduro's rule".
On Monday, the U.S. imposed sanctions on Venezuela's state-owned oil company, Petroleos de Venezuela SA, that could potentially deprive the Maduro government of 11 billion USA dollars in export revenues over the next year.
The US State Department, meanwhile, said Americans shouldn't travel to Venezuela, warning of unrest, the threat of being arbitrarily arrested and the danger of mass demonstrations erupting with little notice.
There is a great deal of hard evidence that the plane exists and its flight was unprecedented, but not as much evidence about its intended objective - although Reuters observed there have been multiple reports of Russian military contractors flying into Venezuela to "beef up Maduro's security in the face of mass opposition protests".
The activity of Rosneft, headed by longtime Putin associate Igor Sechin, is a major element in Moscow's close ties with Venezuela.
Oil minister and PDVSA head Manuel Quevedo said on Tuesday that PDVSA was considering declaring partial force majeure on its contractual obligations in the United States.
In an interview with Russia's state-owned RIA Novosti news agency, Maduro said he was "willing to sit down for talks with the opposition for the sake of Venezuela's peace and its future", an offer he has repeated often but that the opposition is reluctant to accept.
India vs New Zealand, 4th ODI at Seddon Park
Apart from the knocks from Tom Latham and Ross Taylor , there is not much in the Kiwi batting card to show for. An excellent bowling display from the Indians meant that New Zealand could score only 243 runs.
The U.S., a dozen Latin American countries and Canada have recognized Guaido as interim president, while China and Russian Federation have urged non-interference.
Aimed at driving Maduro from power, the sanctions were the strongest measures yet against the 56-year-old former union leader, who has overseen economic collapse and an exodus of millions of Venezuelans in recent years.
On the deployment of the US troops in Iraq, he said it was done "to ensure the country's security".
Lavrov also made reference to news reports of an embarrassing error made by Trump administration national security adviser John Bolton, who flashed a notepad with the words "5,000 troops to Colombia" scrolled across the top in front of reporters.
"In many ways it is sort of an own goal for the United States to place an embargo on Venezuelan oil products", Jn Marie stated.
He said more than 850 people were detained between January 21 and January 26, including 77 children, some as young as 12.
Frank Holder, the head of Berkeley Research Group's Latin American practice, said Mr Guaido could face difficulties in appointing a Citgo board against the wishes of its parent company.
International Brent crude oil futures rose over 2 percent on Tuesday in reaction.
But the United States is Venezuela's largest crude importer, ahead of India and China. That's because Venezuela's oil shipments to China and Russian Federation are usually taken as repayment for billions of dollars in debts.
Chinese Foreign Ministry spokesman Geng Shuang said in response to the move that China maintains "Venezuelan affairs must and can only be chosen and decided by the Venezuelan people themselves".