Hi Rob,
On the contrary, I'd say that our cooperation is even more important now! You can't bail the plan to defend your core - rather, you still need to preserve a capability to hit their coast. Otherwise there's no point at all in nuking them. We gifted you guys just about every unit we had. <<<REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED >>>
As for the timing, it's in about 6 or 7 turns. I'm going to play the save in about 24 hours, so I'll send you another update.
It would really help us if you were able to give us as much detail as possible about their invasion: how many units, where, can you still see their navy, etc. Screenshots are probably the easiest way to do this.
Or are you considering suing for peace? Any techs that we have traded between us are off-limits in a peace deal, obviously.
Best,
Peter