From BBC News:
An agreement between China and Japan to jointly develop gas fields in the East China Sea has been hailed as a major breakthrough.
Over recent years, the two sides have clashed over issues ranging from Japan’s attitude towards its World War II history to the safety of Chinese products.
This agreement is being seen as one more step in a gradually improving relationship between two countries that have had a troubled past.
But there are still a number of unresolved issues between the two – not least the position of the maritime border between the two nations.
Read also Mutual gas benefit stressed / East China Sea exploration pact highlights Japan-China ties by Osamu Kawakami, Chinese vice FM: progress on Sino-Japanese relations creates conditions to resolve East China Sea issue, and Vice FM: Chunxiao oil field’s sovereign rights belong to China by Xinhua.