While Russian forces have staged a successful counteroffensive in the border region of Kursk in the last week, their attacks in the eastern Ukrainian region of Donetsk have slowed to a halt. Ukrainians have begun launching counterattacks along that eastern line, particularly in Toretsk.

The last time Ukraine signed a peace accord with Russia, 10 years ago, it brought only sporadic violence, mounting distrust, and eventually full-scale war. Here’s what we can learn from that history.