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You can contact a Defense Officer on a station to negotiate various diplomatic options. You must contact a Defense officer who works on a station, not the hireable defense officers you can recruit.

Contacting a Defense officer working on an NPC station will give you a new dialogue option, Diplomacy. You can't contact a Defense officer of a faction you are enemies with to negotiate, instead, you must contact a Defense officer of a faction you are neutral and above with in order to negotiate.

In order to negotiate with a faction you are enemies with, you must contact another faction that is not enemies with the faction you want to negotiate with. So for example, the following:

If you are at war with PMC but you want to make peace with PMC, you can't negotiate with PMC directly, however, you can contact a mediator in order to negotiate with PMC. Any faction that is neutral to, or friendly with PMC can be contacted. So, you could contact Ledda Industrial, or Albion Energy subsidiary or another corporation that is neutral to PMC in order to negotiate with PMC. They will mediate the negotiations. You can then contact the Defense officer on a Ledda Industrial (or other corporation) station and choose the appropriate options in the dialogue menu to negotiate.

You can buy/sell/trade stations, zones, even whole sectors if you own any fully. You can even give tribute to increase relations, make peace, make war, etc. There are calculations which determine the value of whatever it is you are trading and the calculations also take into account the strength of the factions you are negotiating with. NPC factions will always try to get the better deal.

INVASIONS

Not yet Implemented, Stay tuned for this very cool feature!Now implemented! NPC factions you are enemies with will send scouts looking for your stations. These scouts must find a station of yours and report back to its' base in order for an invasion to take place. You will receive messages in your log informing you of these events. Make sure to stop the scout as soon as possible if you want to avoid an invasion! Otherwise, prepare for a fight! Enemies can't search you out everywhere in the Universe, though. Factions will search for you where they have a presence (PMC in Albion or Devries for example).