To note, nobody really does _modern_ russians in 15mm – cant really say about 28mm, in total. Caesar had, at least in some point, modern russians in their pipeline for 1:72, in plastic.
In 15mm, Eureka ones, in all their high quality, are the most closest one, but they are most suitable from 1990s to early to mid 2000s (also for georgia, with some mixing) as they wield early 90s pattern chestrigs/webbing, and sadly they completely lack RPK-equipped poses.
They also lack all heaviest support weapons (fex. AT-7/AT-13) though they do have excellent AGS-17 and NSV in their range.
With 28mm Red Star ones, AFAIK, it is pretty much the same thing though they are more suitable, as they have at least the support weapons (though I have no idea was the drumm-mag ever major issue for RPK-74 – for RPK it was), but they also have older flakvests (if any), older webbing and some even wear BVD-vest which, AFAIK, has become quite uncommon during recent years, as better options have appeared, but it is plausable still. Also, the AK type they are using is AKM, but the lack of long muzzle break might be a casting decission too.
Like with eureka, they are for chechen campaign, so pretty much stuff for 1990s.
If ultra-modern cold-weather look is desired, the most notable difference is that the new winter uniform (part of the new-gen uniform) wont have that fur-collar. Also, the combat load has changed (though steel helmet with "composite" lining will remain service in certain units – seen few pictures from spring 2013 where shifra-pattern summer uniform was used with older helmet), some units have adopted the composite helmet in full numbers, protective vest is 6B12, most of the troops have 6Sh-series webbing/load bearing vest (either 6Sh92, 104, 112 or some other version/subversion), etc.
But as it is (vast) Russia we are speaking about here, it is possible that in event of war, not all army line-units are in full equipment strenght, most likely marines and lads-coming-from-the-skies would have priority. And to note, in field conditions, it is extremely common that consripts wield privately purschased equipment.
Few references:
Modern Cold Weather kit
Clearly for show-off, with tacti-cooled new AK and the newest helmet, in total "Ratnik"-personal gear.
And first "from field" picture, he is wearing shifra field uniform, but in addition hes helmet cover is in flora, and so is his 6B12 vest.
link
In full modern gear, pic taken in Indo-Russian excercise in summer 2013. Full shifra (Barmitsa?) + latest composite helmet. But Im not sure are they from ground forces or from VDV.
I play ultra-modern 15mm Russian motorised rifles myself (against chinese!), and I did use eureka figures with minor modifications (PKMs to PKPs, all helmets covered, scratched/converted support weapons, like the allready mentioned Metis-M)
And using QRF soviet infantry as modern russians, well, that is pretty much as accurate advice than to use 1970s SLR-armed brits as US army in vietnam.. :D
Peter Pig and Khurasan are both great manufacturers, but I am quite sure they dont make completely suitable figures for this. The hardened militia are the most closest ones as russians, but no correct swap-heads are available – from them, at least. And they are lacking quite a lot of stuff like UGLs, RPKs (they are with RPDs), PKMs and disposable AT-weapons. Also, the khurasans to become soviet motorised rifles are for 1960 to 70s IIRC, so wont be any better than QRFs.
The chinese are terrifyingly rare in 15mm, QRF and Rebel both do some modern-ish infantry figures, but no hope about modern APC/IFV if we forget the BMP-1 clone (type 86 – which, though, is still used in numbers) and QRF produced obsolete YW531.
Edit: Corrected myself, Ratnik is the name of new-gen suit/equipment load.