"It’s not going to be like toppling Hussein,” the retired general said.
"I don’t see the opportunities to solve this diplomatically at this particular point,” Mullen said.
Missiles that F-35 stealth fighters already carry need only slight tweaks to be able to target ICBMs, an aerial combat expert says.
South Korea's dronebots will be operated by a team targeting North Korea’s nuclear and missile sites.
China does not believe in the arms race, a military analyst said.
"We have a responsibility to plan for all hazards," emergency management administrator Vern Miyagi said.