China has developed 2nd Strike Capability against the US

The US intelligence community believes that the Chinese have deployed missiles that would give it second strike nuclear capability, in a conflict over the United States. They have developed and deployed submarines that can launch missiles with ranges from 8,000- 13,000 kilometers. Several types of their submaries have the potential to carry multiple warheads By 2007 it is predicted that they will have a submarines that can overwhelm existing US defenses and hit the continental US. (Insight Magazine)