first attack this man has made. back in 2010 he attacked a japanese ambassador to seoul. he tried to throw a piece of cement at him. the ambassador was fine but he does have a precedent of attacking ambassadors. we also know that on february 24th he was photographed he put that photo on his blog shown protesting outside the u.s. embassy. protesting against these military drills. so of course the question now is about security and the fact that this man was able to sit at the table right next to the u.s. ambassador jury this event. don. thank you, paula. i want to bring in cnn national security analyst juliet. juliet you say this is a highly unusual attack and it s very alarming. why do you say that? well most of these countries have different threat assessments. that s how the state department judges who is going to get what