An opposition demonstrator clashes with soldiers loyal to Venezuelan President Nicolas Maduro after troops joined opposition leader Juan Guaido in his campaign to oust Maduro's government, in Caracas, April 30, 2019. "But we are hopeful, and I think that this is the beginning of the end of this regime", said Jose Madera, 42, a mechanic, sitting atop his motorbike.
Venezuela's UN Ambassador Samuel Moncada rejected Bolton's remarks as "propaganda".
Flight tracking service FlightRadar24 on Tuesday evening showed some flights between South America and Europe were crossing Venezuelan airspace, but at altitudes above 26,000 feet.
Opposition leader Juan Guaido had called for the "largest march" in Venezuela's history and on Tuesday asked the military for their backing, but the armed forces leadership has so far remained loyal to Maduro, who has been in power since 2013.
Tensions grew through the day as pro-Guaido protesters rallied and pro-Maduro forces struck back with tear gas, rubber bullets and water cannon.
Russia, which has substantial economic ties to Maduro's government, in March sent planes carrying almost 100 military personnel the USA government believes included special forces and cybersecurity experts to Venezuela.
"Today Venezuela has the opportunity to peacefully rebel against a tyrant who is closing himself in", Guaido said.
Important decisions on CPEC, trade expected during PM’s visit to China
This is a ceremonial handover of the drug treatment facilities in Sarangani and Agusan del Norte provided by China through grant.
He called on government supporters to amass at the presidential palace to defend Maduro from what he said was a US -backed coup attempt.
Lopez posted a picture on Twitter with men in uniform, and said it was taken at the La Carlota military base in eastern Caracas.
Mr Bolton said they had committed to "to achieve the peaceful transition of power from the Maduro clique" to Mr Guaidó, who the US, UK and a number of the other countries recognise as Venezuela's rightful leader. Germany's foreign minister, Heiko Maas, speaking in Brazil, said: "What we don't want is a military escalation, but rather a political solution".
Elsewhere, Spain's socialist caretaker government urged restraint, while the governments of Cuba and Bolivia reiterated their support for Maduro. If that's what's required, that's what the United States will do.
Maduro's foreign allies include Russia, China and Cuba.
Lavrov also condemned what he called the United States' "interference" in Venezuela's internal affairs as a breach of global law, adding that dialogue between all political forces is required in the Latin American country.
The U.S. continues to prepare for a possible regime change in Venezuela and plans to initiate sanctions against Cuba, National Security adviser John Bolton said on Fox Business Wednesday.