In February Russia chose war with Ukraine. In response, the U.S. chose to dramatically increase aid and arms shipments to Kyiv. But now that a frozen war is descending on the eastern Donbas region, one that is likely to drag on for months, certain questions about the U.S. commitment can no longer be ignored. How long can the U.S. support Ukraine? Can the U.S. control any escalation caused by a Russian reaction to its support? What if no amount of material or intelligence support is enough to thwart Vladimir Putin's ambitions? In this episode, historians Jeremi Suri and Jeffrey Engel discuss the potential consequences of an open-ended U.S. commitment to Ukraine's independence.