With Vladimir Putin’s planned two-day war to topple Ukraine’s democratically elected government now in its third month and Russian casualties piling into the tens of thousands, concerns abound that Putin might take increasingly drastic steps to alter the disastrous situation he faces on the battlefield. To prevent those grim prospects—or at least contain their effects—President Joe Biden should turn to the playbook his predecessors drafted.

The war in Ukraine is proving to be a tragic proving ground for trends that will almost certainly be replicated in other twenty-first-century warfare. Decentralized decision-making, the targeting of population centers, tactical speed in decision-making, the rise of artificial intelligence, vital intelligence sharing, and the strategic impact of moral and spiritual injury demonstrate the boundaries for future combat.

Eric Patterson spoke at Patrick Henry College in Purcellville, Virginia, about how just war thinking can provide analysis on Russia’s invasion of Ukraine.