The White House National Security Council scheduled a meeting for Wednesday afternoon to discuss next steps on Venezuela, and acting Defense Secretary Patrick Shanahan canceled a trip to Europe because of Venezuela.
Russian Federation has strengthened military ties with Venezuela over recent years and sent nuclear-capable warplanes to conduct joint drills in the country in December - just a month after Guaido proclaimed himself acting leader.
Russian Federation military spokeswoman Maria Zakharova blamed the United States for escalating tensions.
Although Guaido has earned the backing of the U.S. and dozens of other Western countries, Maduro holds the support of the armed forces and Russia, China, Iran, Turkey and Cuba.
Maria Zakharova, a spokeswoman for Russia's Foreign Ministry, said such assertions were part of a "global information and psychological war against Venezuela and Caracas".
Thousands of marchers protested in Venezuela on Wednesday to try to force socialist President Nicolas Maduro from power as tension grew between Russian Federation and the United States over the political standoff in the OPEC-member nation. "It's not going to lead to an improvement of relations".
After a telephone conversation between Secretary of State Mike Pompeo and Foreign Minister Sergey Lavrov on Wednesday, the Russian warned of "the most drastic of consequences" if the US continued what he called "aggressive steps".
"I wish I could talk about them because I think the American people would be proud of our capabilities", he said.
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Venezuelans were expected to again take to the streets on Wednesday for what Guaido pledged would be the "largest march" in the country's history.
"We condemn the murder of the youth Jurubith Rausseo", who was hit by a "bullet in the head during (a) demonstration", the non-governmental Venezuelan Observatory of Social Conflict said on Twitter.
Meanwhile, Venezuela's living standards have declined this year with a series of blackouts and water shortages adding stress to an already hard situation for many facing hyperinflation and food and medicine shortages.
Guaido says he is backed by members of the armed forces but Maduro insists he still has their support.
Ted Galen Carpenter, a senior fellow at the libertarian Cato Institute, said the military was the crucial player in preserving Maduro's rule and that Washington has been surprised at the modest number of defections.
"The hour has arrived for us to look for other ways of doing politics", Figuera wrote.
"Bolton, Pompeo (and Guaidó) say they want a 'peaceful transition, ' even while creating chaos in the streets and calling for a military coup", Gerry Condon of Veterans for Peace wrote for Common Dreams on Wednesday.
Bolsonaro, who assumed office in January, has helped lead the regional opposition to Maduro's continued leadership in Venezuela. "The U.S.is big on Venezuela and wants to bring this to an end but that can not do that". "The people of Venezuela are defending Venezuela".
"So, what we expect today are protests on both sides, but what will really define the current situation will be the discussions among the elites of the country, and the negotiations that are taking place outside Venezuela", he added.