It would most likely be in a lot of peoples interest to question China's military build up IMO. I dunno, maybe Japan is trying to stir the pot, but as I see it they are bringing up questions about China because they are not allowed to start building up their own military beyond a restricted defense force.
So it sounds, to me, a lot more like a forewarning so that in the future they will be in a better position to start their own build up, for they have previously voiced concern.
"George Bush says he speaks to god every day, and christians love him for it. If George Bush said he spoke to god through his hair dryer, they would think he was mad. I fail to see how the addition of a hair dryer makes it any more absurd."