Pashinyan has faced political pressure since Armenia ceded swathes of territory in its war with Azerbaijan last year over the mountainous region of Nagorno-Karabakh.

Turkey backed Azerbaijan in the six-week conflict, which ended with a November truce brokered by Russia.

But although Turkey and Armenia have a complex history of troubled relations, Ankara said it stood by Pashinyan's democratically-elected government.

"We strongly condemn the attempted coup in Armenia," Turkish Foreign Minister Mevlut Cavusoglu told a news conference in Budapest.

"We are absolutely against coups and coup attempts anywhere in the world."

Pashinyan urged his supporters to take to the street and dismissed the head of Armenia's general staff on Thursday, as the country teetered on the brink of chaos.

Cavusoglu said coup attempts threatened to destabilise the entire Caucasus region.

"Therefore, we are against it," he said.

"In democracies, people could criticise the government and demand its resignation. This is natural. But the army's call on government to resign, let alone stage a coup, is unacceptable," Cavusoglu said.