Despite receiving an official mod SDK and fan-made tools that are compatible with it, Red Alert 3 got few mods when compared to its predecessors. However, one mod for Red Alert 3 took the spotlight recently - Eastern Loong. Its selling point is the addition of the fourth faction, China, with its own visual identity and techtree. It has its own way of building structures - having them drop from the sky, and the units are fully voiced, albeit in Chinese, since the development team is from China as well. There's even an article on Kotaku about the mod! Check out the mod's ModDB profile page and give it a run.