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We all know about coception of "assymetrical balance", which means that factions can't be similar and all should have some powerfull sides, but some weak also. Like OP Riflemans with low power of tanks of USF or no artillery or snipers for OKW for exchange to top-tanks in game and nice spec-ops infantry.
From this concept, USSR designed to be very offencive faction (there was some scheme from Relic, showed playstyles of factions, would be nice if you find it). Guess, because of that USSR has absolutely NO defensive positions, even doctrinal. No bunkers, no fiering positions, no heavy AT guns...
But in exchange to "no-defenses" USSR getting... what? Good/OP infantry? But no, stock soviet infantry are worst infantry in game and doctrinals... even they are not that cool, as UK Tommyrifles, for example, or oberSSuldaten. Maybe good/OP tanks? But no, UK and all Axis factions have way better tanks both in stock and in doctrines. Only better thing in USSR is wide choise of artillery (B-4, ML-20, Katyusha), but artillery is support-type unit, not combat. That's not, that "offencive" faction should be powerfull in, don't you think?
So, If USSR haven't anything, that could make them really powerfull in offencive game... maybe Relic should give them something for deffensive?
I suggest to give to USSR defensive structures, like DShK MG position (USSR's base defense). That MG position would also heal 1 important problem in game - maximspam. For expample - I have to spam maxims in 4-5 squads, because when I capture all points what I need (fuel + VPs) I have to protect them from enemy comeback, so I need defenses, and only MG (for to stop infantry attacks) that I have is... Maxim. Maxim wasn't designed to be deffensive, so it covers only small area by fire so... I have to call more and more, for to close all frontline possible breaches.
In meantime, Ostheers or USF can build MG points there and use them, as breachclosing tools. That's cheaper (in MP), takes no popcost and you shouldn't spam your MG units (because of that, I suppouse, MG-42 spam is pretty rare, such as Vikkers or 0.50) and requiers way lesser microcontrol, cos bunkers works like Javeline rockets (shoot and forget), but here it is "build and forget". It will be way lesser headache for USSR players.
There also can be added long-time ago asked doctrinal BS-3 AT gun. It may be used in doctrines instead of such abilities like "Call M-42" or "Hit the dirt" or something like that useless. What for? Because it is ridiculous to see, that top AT-gun of USSR ISU-152 can't penetrate with AP frontal armor of Panther (saw that a lot), while Elephants and Jagdtigers doing whatever they like with IS-2 or same ISU. USSR should get something really powerfull in AT, for to have real counter to KTs, JTs and other overarmored beasts.
If you think, that giving defenses to USSR will break game balance, then... I suggest to start to buff main soviet offencive units. Make soviet infantry more reliable, make soviet tanks more powerfull. Maybe some infantry/armour units should be buffed to overpowerd level. It might sound ridiculous, but again - USSR has no defenses at all, understand it. So it would be very fair to compensate that huge loss with some OP infantry and tank units. But OP infantry right now are in other factions and OP tanks... mostly Axis and UK's.