We face what appears to be one of the most volatile security threats of the last decade as the two Koreas threaten each other, and us, with talk of war growing graver by the day. We asked Dean Cheng, a China expert at the Heritage Foundation, to tell us just how had things really are and what the PRC’s role should be. Cheng’s conclusion: This is a defining moment for Beijing. After North Korea’s blatantly unambiguous, and indefensible act of sinking the South Korean Navy’s ship, the Cheonan, Beijing is either going to side with the angels or the demons. South Korea, the US, and even Japan should mobilize global pressure on China to join in the international response to North Korean aggression.