In this situation NOTHING could be done. If you think there was then tell me.
If you have 2 aggressive Emperor AIs nearby then it's constant combat zone. You can't quickly draw them back because they build units on insane speed. I control units really, really good and casualties are like 20 to 1 but they still spam units faster than I kill them, even getting close to city is nearly impossible. And then War Wearyness makes things worse, to the point when I have to accept peace treaty, during which they build another tons of units and when peace treaty ends attack me again. I have to build units in most cities just to be able to defend, and pay tons of gold to support them.
MEANWHILE, OTHER PLAYERS SIT PEACEFULLY ON OTHER CONTINENT AND ADVANCE TO SINGULARITY.