Japan's Rising Sun Flag has emerged as a key element of the strain in bilateral relations.
For Kan Kimura's latest contributions to The Japan Times, see below:
Seoul's claim of putting the wartime labor victims first doesn't stand up to scrutiny.
Overconfidence led to disappointment, and could signal a new direction in relations between Tokyo and Seoul.
The days when Japan and South Korea enjoyed mutual trust, each believing the other to be a friendly power, are coming to an end.
A recent ruling by South Korea's Supreme Court has global implications.
South Korean President Moon Jae-in's behavior gives no indication that he attaches importance to bilateral ties with Japan.