Russian president vladimir putin pines for the old Russian empire and takes Ukraine’s independence as a personal affront. But the invasion of Ukraine is not a limited regional dispute between neighbors. Putin is also motivated by a deep opposition to democracy more broadly. That is why he has waged a long-running shadow war to destabilize free societies and discredit democratic institutions in the United States and around the world. Ukraine is one flash point in a larger global struggle between democracy and autocracy—one that stretches from the steppes of Eastern Europe to the waters of the Indo-Pacific to the halls...