The obvious counterargument is that previous talks have produced no resolution. But this time the stakes are higher as Kim's weapons programs move forward. Everyone at the table would be more nervous than ever. Consider the Chinese position: They fear THAAD because the system's powerful radar can peer beyond North Korea into China, theoretically identifying Chinese missiles and scoping out troop movements. Thus it could upset the balance of power with the U.S., setting off an increased arms race. So the Chinese would enter talks knowing that if they don't want THAAD in the neighborhood, they have to help restrain North Korea.