I'm playing the aedui campaign (vh/vh), already defeated Arverni and I'm engaged in an endless war against Romani.
It happens about every 10 turns that a roman diplomat ask me to become protectorate.
The first times I've firmly refused, but then accepted making a payment request of 5000-7000 mnai. They accept the proposal, but then I re-open the diplomatic page and simply inform them that the military access has been canceled. The negotiation is then closed and so we are allied with trade rights granted.
What is strange is that all this happens while they siege one of my cities so, just after negotiation, the siege is temporary stopped but then they started it again in the same AI turn!
Diplomatic behaviour is just opposite to military one.
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