Serzh Sargsyan, who ruled the country for ten years before moving into the prime minister's seat, surprised many when he stepped down Monday amid massive anti-government protests, AP reported.
Parliament said in a statement a vote will be held on May 1 to elect a new leader, potentially spelling a way out of the post-Soviet nation's biggest political crisis in years.
Nikol Pashinian, who leads the opposition and wants to be nominated for prime minister, held talks earlier Thursday with parliamentary factions to secure support for his candidacy.
Sargsyan's party still holds a majority in the parliament, however.
Tens of thousands of opposition supporters rallied in the Armenian capital Yerevan Wednesday, calling for Pashinian to become prime minister.
Pashinian is calling another major protest in Yerevan Thursday as an apparent show of popular support for the opposition.
"Protests will grow throughout Armenia until authorities can hear us," he said.
The Kremlin is watching its small but strategic ally, where Russia has a military base, with concern. Moscow, however, has showed restraint in its reaction, insisting that the demonstrations are a domestic matter for Armenia to sort out.
The Kremlin said Thursday President Vladimir Putin discussed the crisis on the phone with Armenian President Armen Sarkisian, Sargsyan's ally. On Wednesday, Russia's ambassador to Yerevan met with Pashinian.