Well I dont have much experience using it against the ruskies but, against USA I usually would build 1 additional pioneer then T1,volks,mg,volks,volks,(get Med bunker ASAP)T2Pak...then it really depend on situation on what to build next. The defensive strat help the bunkers be stronger and lets you reinfoce beside them(once you get it on command tree) which really can help. You need to put the med bunker close to front lines but in a area it can be protected. But once you medics get fallen soldiers you will soon have a army of zombie-grenadiers which you can arm with mgs or panzerschrecks. Hope this helped