Chandran, I don't know your focus on the Australia and S/Korea relationships you may be researching on: Is it on economy or political negotiation? Meanwhile, negotiating between two different nations that have cultural and political differences, one has to consider some factors. These factors include cultural, political differences and the need to understand and identify the 2 countries' interest and the most common manipulated tactics used by difficult party. It is when one understands the underlying interest of such a party then he or she can be able to create a durable relationships.
Having said this, I want to add here that, Australia - S/Korea politically have a good foreign relationships which began since May 1963 when the 2 countries established their diplomatic ties with one another. It could be recalled also that, during the Korean War, Australia sent about 17,000 troops to defend Korea and these troops were only pulled out by cease fire agreement.
In terms of economy, the 2 countries are members of the Asia Pacific Economic Cooperation and there is a future cooperation based on the 'Free Trade Agreement known as the "Korean - Australian Free Trade Agreement" {KAFTA} finalised in 2014 which reduces trade and investment barriers, making it easier for both the countries to trade. According to Australia's Department of Foreign Affairs and Trade, "Australia and Korea have one of the strongest and most complimenting trading relationships in the Asia - Pacific region.
Going by this brief history of the relationships that is exiting between Australia -S/Korea, which styles of negotiation do you think you can apply: Is it the Competing{concern for substance}, Collaborating{getting what I want}, Compromising{concern for relationship}, Avoiding{letting them get what they want} or Accommodating{getting what you want} Styles of negotiation and in which area of negotiation are you applying this?
As being referred by other scholars, there are books or research works on foreign relationships and styles of negotiation between nations that can help you in your work. These textbooks are being recommended and I to also recommend these two for your task