a bit exploitive, isn't it?The vote interval for the AP is 9 turns. So even if they forced peace, you've only got 1 turn remaining by the time the "give city back" comes along. So it's very easy to redeclare at that point.
Even easier, however, is to get a Cease Fire as soon as the "forced peace" vote comes up. Then, even if the resolution passes, you can immediately redeclare war.
Bh