US, meanwhile, says it isn't planning any military response
                                
                                
                                    (Newser) -
                                    With North Korea and South Korea teetering on the  edge of war , what did Kim Jong Il and his heir apparent, Kim Jong Un, spend the day doing? They visited a soy sauce factory, reports  Aol News , via a dispatch from the state news agency. The father-son duo also visited...