Honestly, till last events I was sceptical with eventual Russian unfairness in their approach and practical action to back favor to Iran, but now is obvious that they are loyal to Iran in the context of actual geopolitical challenges...
They have to be helpful and supportive to Iran, Iranian experience in their own long war with practically whole west and Israel and countless regional proxies.... Iran is their mentor for keeping results without total economic waste of resources and economic collapse...
There is a reason why no one talk about turkish omnipotent drones anymore, while Iranian models are evergreen and essential in modern warfare....
But, to be fair, Iran with technology advanced enough to be powerful in last segment of military they needed, modern aircrafts, should be very satisfied, but that's not all... As zioni-megaphone Eric Watchman alarmed, and I trust him for the first time, Russia and Iran have dark intentions of strangling Israel, that will in best possible scenario for Israeli, loss Golan and all strategic edge over Syria and Lebanon...
And I am sure that in some way, Iranian confidence and sort of panic in Israel in last period, is also partly because of this collaboration...
Russian expectation is that Iran will not interfere in their zone in Central Asia or -Stan states...
Central Asia for Middle East is not bad combination for Iran... there is no love in geopolitics, just if two sides have mutual interest...