War against computer controlled countries? (Little Upsilon)

How many and what kind of navy weapons do i need to defeat a avarage computer controlled country?

And what is the best strategie to do so?

dont bother with naval weapons to take a c3(computer controlled country). Naval weapons are very expensive and not worth using to take them.

What should i use instead, if the c3 is far away?

Don't take c3s far away unless you really need to for a specific purpose. If you do really need to I guess I'd use navy fighters and missle cruisers.

And what is most effektive for local C3 countries with and without a common boarder?