[Arkcon]

Protectorate and subjugation do not allow resupply. In fact, your ships path to avoid each other as if you were enemys. Combat does not result from occuping the same sector, you ships just don't want to. Never checked if planets blockaded each other.

You can remember this by noting, the Subjugation and Protectorate treatys are drawn in yellow, like non-agression. Not green like trade or above, or red like non-intercourse or war.