I learned your nation had a long tradition of neutrality.

Although Swiss is a neutrality nation, the most similar thing to south Korea is that Swiss is surrounded by the strong nations like Germany, France, and Italy. = South Korea

So, I wonder what is the significant thing for Switzerland to do diplomacy?  = So, I wonder what is the significant diplomacy in Switzerland? 

Do you have any suggestion for South Korea?

secondly, when is the most meaningful time as the secretary? = Secondly,

what is your motive to be an ambassador? = What is your factor to be an ambassador?