US Accuses China of Secret Nuclear Testing

I smell skulduggery.

They say this was detected years ago, but they chose not to even say anything about it until "a day after the treaty limiting U.S. and Russian missile and warhead deployments expired"?

I don't buy it. I do buy that China has a lot more nukes than before, there doesn't seem be to be any disagreement about that, but "revealing" years-old tests now smells more like an excuse for US build-up than anything else.