As concerns grow over North Korea's military provocations, a range of experts are warning that for various reasons, the U.S. cannot count on China as a reliable partner in defusing the crisis on the Korean Peninsula. Early Sunday, the U.S. military said it had conducted a successful test THAAD weapon system test over the Pacific Ocean, a response to Pyongyang's latest missile test. That came on the heels of South Korea announcing a new precision ballistic missile it claimed is capable of destroying North Korea's nuclear facilities and tunnel strongholds.