What do you mean by the expression balancing on the brink of war?

This expression means that the parties are in a rather tense relationship, that is, they are balancing on the brink of war. It also means that a war is about to break out between them. You can also give examples from history. For example, Prussia and France in 1870 teetered on the brink of war, which happened. A war was unleashed between them, which, however, ended with the complete victory of Prussia and the crushing defeat of the French.