I am well aware of the fact that this incident causes conflict between Japan and Korea.
And I understand that changing the name is not that simple a task.
However, it is correct to mark the name of the place you know 'Sea of Japan' as 'East Sea'.
I think one wrong word can undermine the credibility of the entire news.
Please check again and correct it.
If it is difficult to completely change it, I suggest that you mention the two names together.