Silos are so far a apart that single warhead can destroy only one silo.<p>Arms control experts seem to think that China is building missile "sponge". Field of 120 silos would contain only 12 ICBM's or so. If they build enough silos into the desert and and decoys for the rest, the US must spend more and more missiles to destroy just few missiles.<p>The US had similar plan at the beginning of the Cold War. It became politically impossible to use eminent domain to create so large missile fields on farmland.