Russian President Vladimir Putin saidhe supported in principle Washington's proposal for a 30-day ceasefire with Ukraine but that his forces would fight on until several crucial conditions were worked out.

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 has reportedly laid out its demands for ending the war in Ukraine and they mirror previous requests made to Kyiv, the U.S. and NATO.