"If you asked experts what could happen to bring the regime down, it would be the sudden death of Kim Jong-il. That has happened now," said Victor Cha, a former U.S. National Security Council director for Asian affairs under President George W. Bush and now a senior adviser at the Center for Strategic and International Studies, an American think tank. "We're potentially at a watershed moment for the region."
"For the United States, up until today, the North Korea problem was a denuclearization problem," said Victor Cha, a senior adviser at the Center for Strategic and International Studies. "Now it is potentially a loose-nukes problem."