Recently the Excited News reported the following:
The Association of South East Asian Nations (ASEAN) adding Japan, China and South Korea became the ASEAN-plus-Three (AMRO) was established as the region's economy watchdog; regarding its top personnel matters, it was understood on the 11th that the informal decision time to declare China's opposition to the choice of Japan was postponed.
The diplomatic source of two or more countries clarified it. A person related to Japanese Government pointed out, "Recent Japan-China relations deterioration affected it". It showed that China was watching closely on matters that Japan was taking leadership.
It seems that China is challenging Japan and seeking more influence in the region.