The implication is that the Japanese "militarists" are the only people who perceive China to be of concern for her neighbors or the world.
While acknowledging that historically Korea has had problems with Japan, one would think that recent history would lead Korea to prefer that Japan act as a counter-balance for China's military. The US seems to be relinquishing that role.
Well bully for them. What are they supposed to do, sit around waiting for an American president who may or may not help them in time of attack?
If China is nervous - good. They should be. In all the first hand accounts I have read about the Japanese soldier in combat during WWII they are to be feared and respected.