War in the 21st century will remain a chameleon that takes on different forms and guises. This book, edited by Tim Sweijs and Jeffrey H. Michaels, offers the first comprehensive update and revision of ideas about the future of war since Russia’s 2022 invasion of Ukraine. World-renowned international experts from the War Studies field consider the impact of the war in Ukraine on the broader social phenomenon of war: they analyse visions of future war; examine the impact of technological innovation on its conduct; assess our ability to anticipate its future; and consider lessons learned for leaders, soldiers, strategists, scholars and concerned citizens.