Ukraine's allies have agreed to put pressure on Russian President Vladimir Putin to agree to a legitimate cease-fire proposal after a virtual summit of Western nations' leaders that didn't include the United States.

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.

Russia and Ukraine traded heavy aerial blows overnight Saturday, with both sides reporting more than 100 enemy drones over their respective territories