Simple, because the benefits. Qu praised the use of force, It never is not our culture, we believe that peace and order and security for trade to increase, while trade to make the maximum benefit, and the economic integration of China and Southeast Asia can bring more benefits, the war can only destroy, not create.
China does not have a very hard stance on the territorial issue and India, at least in the past, but not the same as the South China Sea, which is energy security in the future, China also has enough historical and practical reasons, so going to compete, but even so, I think that China also does not want to eat the food alone, as long as some Southeast Asian countries can cooperate.