Last year the Pentagon financed RAND Corporation released a report that laid out plans against Russia:
Drawing on quantitative and qualitative data from Western and Russian sources, this report examines Russia's economic, political, and military vulnerabilities and anxieties. It then analyzes potential policy options to exploit them ideologically, economically, geopolitically, and militarily (including air and space, maritime, land, and multidomain options).
As one option the report discussed to over-extend Russia (pdf) in the Caucasus:
The United States could extend Russia in the Caucasus in two ways. First, the United States could push for a closer NATO relation-ship with Georgia and Azerbaijan, likely leading Russia to strengthen its military presence in South Ossetia, Abkhazia, Armenia, and southern Russia.Alternatively, the United States could try to induce Armenia to break with Russia. Although a long-standing Russian partner, Armenia has also developed ties with the West: It provides troops to NATO-led operations in Afghanistan and is a member of NATO's Partnership for Peace, and it also recently agreed to strengthen its political ties with the EU. The United States might try to encourage Armenia to move fully into the NATO orbit. If the United States were to succeed in this policy, then Russia might be forced to withdraw from its army base at Gyumri and an army and air base near Yerevan (currently leased until 2044), and divert even more resources to its Southern Military District.
The RAND report gives those options only a poor chance to succeed. But that does not not mean that the U.S. would not try to create some additional problems in Russia's southern near abroad. It may have given its NATO ally Turkey a signal that it would not mind if Erdogan gives Aliyev a helping hand and jumps into anther war against Russia.
Unless Armenian core land is seriously attacked Russia will likely stay aside. It will help Armenia with intelligence and equipment flown in through Iran. It will continue to talk with both sides and will try to arrange a ceasefire.
Pressing Azerbaijan into one will first require some significant Armenian successes against the invading forces. Thirty years agon the Armenians proved to be far better soldiers than the Azeris. From what one can gain from social media material that seems to still be the case. It will be the decisive element for the outcome of this conflict.
(Note: You can view every article as one long page if you sign up as an Advocate Member, or higher).