The United States drew closer to its G7 allies on Friday, overcoming differences, at least momentarily, to back Ukraine's territorial integrity and warn Russia to follow Kyiv in accepting a ceasefire or face possible further sanctions.

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.

Ukraine’s consent to a 30-day ceasefire proposal has handed the Kremlin a difficult challenge at a time when its military has an upper hand in the war.