President Donald Trump said Friday that he was “being a little bit sarcastic” when he repeatedly claimed as a candidate that he would have the Russia-Ukraine war solved within 24 hours — and even before he even took office.

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 military denies the encirclement of its forces in Kursk, after Trump asks Putin to spare the lives of thousands "surrounded" by Russia's military.