Hate each other as allies. (Sid Meier's Civilization 6)

The game was deadlocked, all countries except Rome United and allied. A Declaration of war one leads to war with the world. It's impossible to find the time to volunteer not to catch, you have to fight with their allies. Actually as spend some chosen country with the world so that at least for a while with it has not concluded the Alliance and that is the time to strike?