Lurker comment:
Don't panic! Appears you will get 2 shots at Asoka's ships with those Frigs, and have good chances to reduce that to 18 or 15. And the AI will often bring too little siege and wait for full bombardment; whipping Walls in Recife won't save the city but could well buy a couple crucial turns.
Depends what's on the boats and where they go, but I think there is a reasonable chance to come out of this losing Recife and one other weak eastern SA city...not good but not doomed either.