Russia said on Saturday it would provide "necessary" assistance to Yerevan in its conflict with Azerbaijan over the breakaway region of Nagorno-Karabakh if fighting reached Armenia's territory.

"Russia will render Yerevan all necessary assistance if clashes take place directly on the territory of Armenia," the foreign ministry in Moscow said, calling on the warring sides to immediately halt fire.

Earlier Saturday Armenian Prime Minister Nikol Pashinyan asked Russian President Vladimir Putin to begin "urgent" consultations on security assistance.