Dear Khun Paveena,
Regarding your question about national interests and how the state can survive competition in world arena while aiming at a peaceful world, my answer can be very short and simple: 'coopearation' ka - now I am taking a liberal institutionalist approach, rather than realism in the IR terms
. Specifically, this concept of cooperation also supports a number of ideas in Buddhism philosophy.
Obviously, we can see from an example of European Union, a cooperation between France and Germany after the Second World War. Cooperation was the mean to prevent war....leading to peaceful, prosperious as well as increasing competitiveness of Europe in the world economy - an increasing important role of the EU in the world. Of course, national state interests and sovereignty are still important, though states seem to cooperation more through a wide range of international organisations in different layers, levels and sectors in the world arena. Isn't it ture?
However, I am not saying that realism, i.e, protecting national state intersts, is dead...of course, it is still existing ka.
Not sure this argument is anwering your question ?
Ps: Sorry I do not have Thai fonts here, cannot write in Thai naka.
Thanks khun Ponbun, Da Vindi (CODE), and khun Boonthong for commets naka.