I'm trying Zero Signal again, but man do I hate the Soviet terror drones. They keep on one killing Siegfried no matter how much I try and snuff them out. I feel like the whole mission hinges on keeping Siegfried alive. But besides from losing him I was doing pretty well on the mission, I was able to station some Mirage Tanks on the hill to the north of the Allied Refinery area and they were successful in killing the Soviet Scud Launchers that kept coming, this meant I did not have to babysit my refinery and it was mostly safe.
Zero Signal isn't too bad if you know what to do, I simply ignore the allied base and that's it. I scout out the area with rocketeers to kill terror drones, capture the 3 artillery cannons and repair them, place mirage tanks on the hill where the 2 artillery cannons are to kill any scuds coming after you. I also garrison the bunker in the bottom left (where the long bridge is) against Qilins. Using Siegfried, i slug through the Soviets in the north to get straight to their base. The spy turns off their power, and I rush through to capture their Conyard and destroy their nuke, field bureau, and battle lab/palace/whatever. So they can only build Rhinos and borillos now, you can mop them up as you please. Just don't do it too fast (destroying their base) or else you get a big end rush that kinda scared me and had the slight possibility to kill me if I wasn't careful. Scud launchers target buildings and not units unless attacked or threatened, so they can be lured with Mirages to their deaths.