"Russia has no global ambition like the United States, its military is there to protect its sphere of influence and keep access to its spheres of interest open."
I hear this comment regularly from those who attempt to defend the Russian for their indefensible actions.
Regardless of their perception of "their sphere of influence" it does not entitle them to invade and annex independent nations. Much less to actively support tyrants like Bashir Assad as they strategically murder their own citizens.
It's a B.S. argument and if you lived in one of those "sphere of influence" border nations like Latvia, Lithuania, Estonia, Finland, Sweden, Georgia, etc., where you were constantly threatened for doing anything contrary to the Kremlin's wishes, you'd see this ridiculousness completely differently.