People in Russian-held Oleshky in Ukraine's Kherson region have endured war, occupation, and devastating flooding. Now, trapped by land mines and cut off from basic supplies, they face "hell," starving in a virtual ghost town, Ukrainian officials and volunteers say.

Historian Margaret MacMillan warns that increasingly interconnected wars are increasing the risk of a wider conflict, as she discusses Ukraine’s future, Putin’s Russia, NATO’s vulnerabilities, and an emerging “new world disorder.”