text:  China was once a distant third in the nuclear arms race behind the U.S. and Russia, but it's closing the gap. Simply put, China is increasing its nuclear arsenal at a pretty fast clip. Chinese leader Xi Jinping wants to double the number of his nation's nuclear weapons. It's a nuclear deterrent and part of the global competition between China and the U.S. That story on The World. Beginning this afternoon at 1, here on HPR1.