As to your questions:
1/ So far not. But maybe in the future. Key point of WW3 series is recreation of entire brigade combat level with complete disregard of balance whatsoever (thus the special victory conditions instead). Putting it the other way, players are often granted "dream teams" or perfect battlegroups with no weak sides. Here players can form battlegroups as they need them, but they are limited to actual equipment used by certain formations.
Russians, on the other hand, are just one nation and they stick to same regimental or brigade stricture with little changes. This would mean scenarios from Russian perspective to be very repetitive and with little equipment variations.
However, if you are in need of standard attacker-has-advantage-ratio and switching sides check the oil Crisis Spreads (OCS) series.
And to be frank, I just wished SPMBT could allow for 1000 instead of 500 units, that would let me pit 2-3 Russian brigades against you

Sadly, I am pushing the scale of this game to the limits.
2/ Well, this was is surely total, but I take into consideration that Russians had limited time for very massive gear-up and they come in weaker than in, say, 1989. Thus there is no front in Scandinavia and it is not planned. Turkey is considered "friendly neutral" towards Russia what can be the case in real life as well. So the southern Russian flank is protected. Key push is obviously Germany via Poland. Serbs did not yet come into the fray, but I am not excluding Serbians - seeing Russian success - could quickly forget their EU applications. Central Asia is considered puppets, sooner or later I can assure you Kazakhstan brigade will be your opponent in one of the battles.
As of the scenarios, there is always a pattern.
There will be two per nation (Czechs and Slovaks will have them "jointly"). If it is possible, first one will be with "typical" brigade, using the most common equipment in nation's army and describing what that nation would normally contribute into the fight.
The second one will be either with "elite" formation - such as second Romanian or Polish one - with best equipment the nation has to offer. Alternatively, this can be "special" formation, that is just different - like Dutch Light Brigade. British will have one with Air Cavalry too, and so on.