To discuss this, joining me is Zhang Junshe, vice president of China's Naval Research Institute.

Q1. The meeting came just hours after the DPRK test-fired a submarine-launched ballistic missile.  One of the biggest outcomes is that foreign ministers from China, Japan and South Korea have reconfirmed their united front against the North's missile and nuclear programs. Are we going to see China do more in enforcing the UN Security Council's resolution against the DPRK?

Q2. The ministers met against a backdrop of diplomatic rows involving their three nations. How can they deal with this, especially with a goal to set up an economic community by 2020?

Q3. The G20 Summit is less than two weeks away.  What should we watch for in Hangzhou from the interactions of leaders from the three nations?