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.

Russian President Vladimir Putin said Thursday that Russia agrees in principle with the U.S. ceasefire proposal, but the terms need to be worked out.