Back in Brasilia, Vice President Hamilton Mourao denied that the country would participate in an eventual invasion of Venezuela. "It is not of the nature of our foreign policy to intervene in other countries' internal affairs," Mourao said.

Thirteen of the 14 member countries of the Lima Group, except Mexico, signed a declaration on Jan. 4 in the Peruvian capital Lima to urge Maduro not to assume a second presidential term on Jan. 10, the date when Maduro was sworn in as president for another six-year term.

But not all Latin American countries back Guaido's self-proclaim.

"Our solidarity with the Venezuelan people and Nicolas Maduro, in these decisive hours," Bolivian President Evo Morales tweeted.

In addition, Jesus Ramirez Cuevas, the spokesman for Mexican President Andres Manuel Lopez Obrador, said Mexico "is analyzing the situation in Venezuela" and maintains "our position of neutrality in the Venezuelan conflict."

Via Mexico's local news channel, the spokesman said "there is no change in its diplomatic relations" with Venezuela nor with its government till now.