Guaido swore himself in as interim president on January 23 in a direct challenge to Maduro's rule and quickly won the backing of countries in the region
An active Venezuelan general called on the armed forces to rebel against President Nicolas Maduro and to recognize the opposition leader Juan Guaido as interim chief as pressure at home and abroad grows on the head of state to step down.
In a video circulating on Twitter on Saturday, General Francisco Yanez of the air force's high command, said most of the armed forces already disavowed Maduro, who claims he is victim of a coup directed by the United States.
"People of Venezuela, 90% of the armed forces of Venezuela are not with the dictator, they are with the people of Venezuela," Yanez said in the video.
"Given the happenings of the last few hours, already the transition to democracy is imminent."
The high command's web page lists Yanez, along with a photo, as the air force's head of strategic planning.
On its Twitter account, the air force's high command accused the general of treason. Yanez is the first active Venezuelan general to recognize Guaido since he proclaimed himself president on January 23.
The video came as opposition supporters were set to protest nationwide in a bid to keep up the pressure on Maduro after Washington recognized Guaido as the legitimate president and issued potentially crippling sanctions that are likely to further weaken the Opec nation's struggling oil industry.
Maduro's critics also hope to encourage similar moves by European countries. Some European Union member states are expected to officially recognize Guaido next week, while others will likely take a more cautious stance of support.
"We are going to send a very clear message in all the municipalities of Venezuela and in each city of the world, we are going to give a demonstration of strength, in a pacific and organized manner," Guaido tweeted on Saturday.
Maduro on Saturday will also hold a rally, to commemorate the 20th anniversary of late socialist leader Hugo Chavez's first inauguration as president in 1999.
Washington has imposed sweeping sanctions on state-owned oil firm PDVSA in the toughest financial challenge yet to Maduro, as the administration of US President Donald Trump openly seeks to push him from power.
US Vice President Mike Pence told a Florida rally on Friday that the time for dialogue had ended and all options were on the table.
Venezuela is suffering from hyperinflation, produce shortages and a mass migration of citizens to neighboring Latin American countries - a situation likely to be worsened in the short term by the new sanctions.
Guaido swore himself in as interim president on January 23 in a direct challenge to Maduro's rule and quickly won the backing of countries in the region, but still has no control over state institutions or any functions of day-to-day governance.
He has sent letters to Russia and China, both major creditors and allies of Maduro's government, saying that a change of government would be in the best interests of both countries.
Maduro's adversaries say he has run roughshod over democratic institutions, including the opposition-run congress, and destroyed the once-buoyant economy through a corruption-riddled exchange control system and arbitrary nationalizations.
The former union leader calls the sanctions and effort to force him from office an extension of the century-long efforts by the United States to control Latin American nations.