Master of Orion II/Diplomacy and intelligence

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War is merely a continuation of policy by other means

— Clausewitz , On War

In MOO II diplomacy may be a continuation of war by other means. Most importantly:

It provides information about your opponents from the time when you first make contact (and they get similar inormation about your empire).
Espionage and sabotage are often powerful weapons, especially in the early game when warships are slow and weak.

These factors make "diplomacy" important even for Repulsive empires, whose options in negotiations are limited to declaring war and surrendering.

This page summarizes the other options available to non-Repulsive empires - some AI non-Repulsive empires occasionally use a lot of diplomatic moves in an attempt to win via Galactic Council elections.

[edit] How contact is made

Contact is made between 2 empires when either of them is in a position to send ships without Extended Fuel Tanks into systems occupied by the other. This arises when either empire occupies a new system in the right place (by creating a colony or an Outpost) or when either empire discovers improved fuel cells which extend its ships' range.

Contact can be lost if someone (either empire or a third party) destroys or conquers the last colony or Outpost in a system and no other systems ocupied by either empire are within either empire's ships' range. Contact can later be re-established in the ways described above.

[edit] Diplomatic negotiations

All can by initiated by your empire or another one. All are usually forbidden in online games between human players, to prevent collusion.

AI empires become impatient and will refuse to talk for a while if you pester them with too many conversations in a short time or if one conversation goes on for too long - especially if the conversations are unfriendly or lead to nothing.

[edit] Tech trades

One side seeks to gain a specific tech and offers various techs in exchange.

This can be frustrating for human players, as the game offers you a fairly small list of randomly chosen techs to give as part of a trade. You can usually find one of the ones you're willing to trade if you're persistent, but there's no guarantee that you will.

[edit] Trade Treaty

Eventually increases both sides' money income, although initially there's a decrease. It takes about 5 turns to break even, except that Fantastic Traders get into profit in 1 or 2 turns.

[edit] Research Treaty

Eventually increases both sides' RPs, although initially there's a decrease. It takes about 5 turns to break even, and Fantastic Traders have no advantage in Research Treaties.

[edit] Peace Treaty

Ends a war, for a while at least. Both sides undertake not to attack each other for a specied number of turns; breaking this promise damages your reputation with all AI players. If you propose a Peace Treaty, an AI player may ask for a "sweetener", e.g. money or a tech; human players do not get the opportunity for this type of extortion. While a Peace Treaty is in force either side may send warships to the other's systems without automatically starting a battle or blockade.

[edit] Non-aggression Pact

Both sides undertake not to attack each other, with no time period specified. If the treaty lasts long enough diplomatic relations between the empires improve, which makes further negotiations more likely to succeed. But if either side sends warships to the other's systems war is likely.

[edit] Alliance

Like a Non-aggression Pact but with additional benefits and obligations:

Each side's ships' range is extended as if the other's colonies and Outposts were its own. And either side may send warships to the other's systems without automatically starting a battle or blockade.
Your allies expect you to help them in wars. Failure to do so causes diplomatic relations between the empires to deteriorate, and eventually to cancellation of the Alliance. If you're allied with 2 empires and they go to war with each other, you may be able to persude them to make peace (see below).

[edit] Make demand

One side asks for something for nothing. If the relationship is really friendly, this might not harm the relationship, although the side making the concession will probably expect a favor in return later.

Some are sometimes made by an ally, but other empires may make them too:

Declare war on a 3rd party
Make peace with a 3rd party
Break alliance with a 3rd party

Some are reasonable but perhaps optimistic (if the side making them had real power, it would simply open fire); but they may be made by a player who wants to avoid 2 or more simultaneous wars:

Stop spying
Remove fleet from specified system

The system must be one that is occupied by the player making the demand.

The remaining demands are naked extortion:

Demand tech
Demand system

Including all colonies, with their populations and buildings.

Demand 5% tribute per turn

That's 5% of the other empire's gross income, not their surplus.

Demand 10% tribute per turn

Since this would usually be crippling, the answer is usually "No"; war is a common result.

Demand support in the next Galactic Council meeting

"... or your empire will be taken away." Yes, that's what they say.
Apparently human players can't make this demand to AI players.

[edit] Make gift

An empire may do this to persude a more powerful empire that peace is more profitable than war (who do they think they're kidding?), or an empire that wants to win a council vote may do it to win friends. A gift may be one of: