It's not an exact equivalent case, but sometimes you can be surprised...
Catherine declared on a nearby sweet city state. It cried plaintively to the world, "We'll look favorably on anyone who takes out 3 Russian units..." But that's not the way I work...
I turned up fast with 3 Chariot Archers, got her units in range, but did
not fire. Then I went to see Catherine on the standard Trade screen and dialled up "Make peace with city state" on her side and nothing on my (Ramkhamhaeng's) side. No demands. Just a pleasant tête-à-tête.

"That will do nicely sir," she said, and away she went, taking her troops with her.
On the downside, I didn't get the bonus from the city state. On the upside, everyone stayed at peace, and I wasn't distracted from getting a cultural victory inside 300 turns.
Sometimes it pays to be cheeky.