According to David Mitrovica (Internet article on International Negotiation: http://www.cseg.ca/publications/recorder/2001/03mar/mar01-intl-negotiations.pdf)
team members preparing for an international negotiation should:

learn as much as possible about the foreign culture,
its negotiation patterns and
the style of negotiation with outsiders
approach the actual bargaining sessions with a wide range of options and alternatives

In initial meetings, negotiators should emphasise developing a relationship with their bargaining partners. During the discussions, negotiators should assume differences in negotiating style until similarity is proven.

Effective negotiators have high expectations and make high initial offers. They ask a lot of questions and make very many commitments. They search for synergetic solutions,  that means solutions in which both sides win.

In order to succeed, managers and firms need to have strong cross-cultural skills.

Negotiator’s global report card contains the following requirements
 competence 
 preparation
 synergistic approach (win-win) 
 cultural IQ
 adapting the negotiating process to the host country environment 
 patience
 listening 
 linguistic abilities
 using language that is simple and accessible 
 high aspirations
 personal integrity 
 building solid relationships