Ukraine has key demands from Russia as well. Kyiv refuses to cede more territory to Moscow, including those in partially occupied regions. Also, Ukraine is seeking the return of children illegally deported to Russia and thousands of civilians detained in Russian prisons.

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.