Here is a video guide of the First Mission of the Soviet Campaign on Hard.
Evileye purposefully held back building his barracks so we had ample time to build defenses and an army each.
If you have any questions, please do not hesitate to drop them in the comments or shoot me a PM.
Thank You for watching and we hope this helps!
P.S. Whatever you do, don't build your naval yard right next to your co-op buddy. It pisses them off and it wastes a lot of time. :P