Just curious, what difficulty were you playing on ? I only played on H/MThe Parthians did beseige Asaak in my campaign, after I attacked them, but I only tried it the once.
However, your test seems to prove that the Parthians attack Asaak in order to get a war with you - not because they particularly want Asaak itself! (So it's political motivation, not strategic.) Once at war, they're happy, and will go after any town that happens to take their fancy. Bastards...
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