earlier, shery ahn had this conversation with a security analyst and he spent 32 years in the maritime defense force. >> we've been seeing tensions between japan and china for quite some time now, but today china went as far as coming into japanese airspace. what's your take on this? >> yes. it's much more danger than the issue because every countries use military force, especially air force, to respond on the airspace incursion. on the other hand, the japanese coast guard is dealing with china's lower air force ships. so i think this action will involve military force into this dispute. so there is a possibility to escalate both countries' actions. >> quite a dangerous situation. do you think china could take further action over the islands? >> i don't think so. but it is very difficult to find out which level decided to let the aircraft invading japanese airspace. but once happen, this kind of issue, the china's leaders or headquarters must support this kind of action. but we cannot see any kind of change of china's leaders intention for the senkaku islands. the president has already

nhk's shery ahn spoke with him earlier. >> defense minister said that north koreans' technology seems to be quite advanced. what do you think they improved upon? >> of course. north korea is improving the missile technology continuously and they got the basic technology of ballistic missile now. usually the improving the technology is for extending the range of missiles. very roughly say much fuel makes long range but it's not so easy because combustion must be controlled. and also, the attitude of missiles must be controlled, too. it needs high technology. so i think they use basically the same technology from the missile, which was launched last april. they say it was improved which has 6,000 kilometers range. >> what is puzzling is that north koreans and japanese officials said the missile was removed from the launch pad so what do you make of that? >> if north korea really removed missile of launch pad, i think there are two possibilities. one is the fake. north korea didn't want neighboring countries to observe the launch itself accurately because they didn't have the self-confid