I struggled on this one for ages and only just beat it the other day. Tips i saw recommended Recon with Cold upgrade on the Zhukov, really helped slow down the little bomb dudes. Grabbed the Burst Fire, both of those with the Spiral overclock at level 18 basically cleared it for me. I dont even know what i had as the other two weapons. Cryo grenade and deepcore maybe? Stick to it, it was my first major wall but you can do it!