Dozens of people have been reported killed and hundreds wounded since clashes broke out on Sunday.
What do global powers say?
"We do believe that Russian Federation has a major role in the Caucasus and is capable of using political methods to put an end to the bloodshed", Toganyan said.
The OSCE Minsk Group - co-chaired by France, Russia, and the USA - was formed in 1992 to find a peaceful solution to the conflict, but to no avail.
Russian Federation is a party to a military alliance with Armenia, and it has a military base in the country, although it also has close relations with the government of Azerbaijan.
Turkish president says worldwide powers have "neglected" Nagorno-Karabakh for decades.
Rouhani expressed concern about the rising tensions, the Armenian government said, but gave no further details.
The EU keeps its distance from the conflict, considering that the Minsk Group is the appropriate form to address the issues.
French President Emmanuel Macron on Friday (2 October) demanded that Turkey explain what he said was the arrival of jihadist fighters in Azerbaijan - and urged North Atlantic Treaty Organisation to face up to its ally's actions. "It's a very serious new development that also changes the balance of things", he said.
Arms-control advocates have documented the sale of the Wescam gear to Turkey, a close ally of Azerbaijan. In Nagorno-Karabakh, there were voices of overnight bombardment.
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Azerbaijan denied the charges, and Turkey urged the fight to cease.
Macron's statements were confirmed by the Syrian civil war watchdog, the United Kingdom -based Syrian Observatory for Human Rights (SOHR).
The fighter said volunteers were gathering in the Hawar Kilis area near the Syria-Turkey border awaiting transportation.
What is happening on Earth?
Azerbaijan's Defense Ministry said Armenian forces started shelling the town of Tartar last week, damaging "civilian infrastructure" and wounding people, while Armenian military officials reported that Azerbaijani forces were bombing positions of the Nagorno-Karabakh army in the north of the war-torn region.
The Nagorno-Karabakh conflict has its origins in Soviet days.
They added in a statement: "The enemy sought to assemble its forces, but the Armenian forces responded to all these endeavors".
"At the moment we are not needed on the front lines. I will not go anywhere, that's it".
The Globe and Mail newspaper said the firm had received permission earlier this year to ship seven imaging and targeting systems to Turkish drone maker Baykar.
Azerbaijani authorities said nine civilians were killed and 32 wounded on their side.
Armenian officials said an SU-25 from its air force was shot down in Armenian airspace by a Turkish F-16 fighter jet that took off from Azerbaijan, and the pilot was killed. He replied, "Because it is part of the Jihad; it is a holy war of Muslims against Christians". The enclave seceded from Azerbaijan during the Nagorno-Karabakh War that ended in 1994 but has not been recognized by any country as an independent republic.