Bolivian President Evo Morales and his government had first denounced that an attempted coup was underway by right-wing forces seeking to oust his leftist government after he was declared the winner of the 20 October presidential elections. 

Morales announced he was resigning on Sunday night after pressures from the military increased.

"My full support to the president in the face of this attempt to interrupt the constitutional order," Argentinian President-elect Alberto Fernandez said in a tweet. "The region together with the international community, we must follow this situation closely and act in case of any event that implies an institutional breakdown."

The ALBA-TCP countries also issued a statement expressing "support for the Bolivian government and institutions and denouncing the attempted coup d'état in progress, while calling for the return to peace" and supporting Morales' call for dialogue with opposition parties. 

The Cuban government also issued messages of support to the government of Bolivia and denouncing the coup attempt by right-wing forces. 

"A coup d'etat is underway against the legitimate President of Bolivia," Cuba President Miguel Diaz-Canel said in a tweet. "The right-wing opposition refuses to recognize their defeat at the polls and resorts to violence against the constitutional order. We strongly denounce this coup attempt!"