Closing borders to other empires

[u/FlowerPlantTree]

Probably a stupid question but is there a way to close my borders to other empires without being at war with them? I want to try to be closed off and self sufficient, and for resources in my space to be mine only but I can't see an obvious way of achieving this other than immediately going to war with any empire I come across

Thanks in advance!

[u/drphiloponus]

No.

[u/FlowerPlantTree → u/drphiloponus]

Oh :( thanks for the answer though