Kenneth Kim and Matthew Miller released by North Korea . Agreement may be sign of more deals to come , says Christian J . Whiton : Washington can end the cycle of North Korea taking Americans hostage by declaring U.S. passports invalid for travel to North Korea . Kim regime is demonstrating knowledge about nuclear capabilities . Time for U.S. to stop ' romancing ' North Korea , he says .
Kenneth Kim and Matthew Miller released by North Korea . Agreement may be sign of more deals to come , says Christian J . Whiton : Kim regime is demonstrating knowledge about nuclear capabilities . Time for U.S. to stop ' romancing ' North Korea , he says .