AS SOLDIERS AND CIVILIANS IN UKRAINE continue to resist an invasion by Russian troops, a very different kind of war is being fought on a separate front: the internet. Within hours of Russian troops attacking cities and government facilities in Ukraine, hackers—including some who claimed to be affiliated with the underground group known as Anonymous—went after a number of Russian government sites and systems. While some of these cyber-attacks appeared to be designed just to cause annoyance, others were aimed at shutting down the Russian government’s operational abilities, or revealing what military intelligence officials in Russia might know. The battle has also seen attempts by Russia to hack information networks, by using propaganda and misinformation on social and traditional media.