Due to the conflicts between China and Japan, All Nippon Airways said it canceled 40 seats on flights between the two countries between September and November. I think you read / heard / saw, the two Asian countries are "fighting" on a piece of land under which there are large oil fields.
In addition to canceled flights by ANA, China Eastern Airlines has announced that it is delaying the launch of flights between Shanghai and Sendai from northern Japan, and Japan Airlines has reduced the number of flights to Hong Kong from 10 to 3 per week.
I advise you to be careful when buying your tickets and how to establish links to ASIA!