Make no mistake, without the U.S. China wouldn't be anywhere near as advanced in technology as they are. They have no original thoughts. It's ingrained into them to be robots. Without the U.S. to copy and steal from they would never advance significantly.
China may have a lot of soldiers, but it's military still pales in comparison the U.S. The U.S. has more and better fighters/multi role aircraft, and 3 times as many gunships. The U.S. has a significant advantage in the battle ship department and especially when in comes to aircraft carriers. Their navy and airforce would be defeated by the U.S. No way in hell I would give the Chinese robots an edge in pilot capability or ground troops as well.....aaaaand of course we have more nukes.