Ukraine’s president and military are acknowledging their forces have invaded Russia’s Kursk region and seized approximately 1,000 square kilometers of territory. Now, Ukrainian military sources say Russia is pulling some units out of eastern Ukraine to defend against the invasion in southern Russia. Host Marco Werman speaks with Wall Street Journal reporter Yaroslav Trofimov about what’s happening on the ground inside of Kursk and how Russian officials and citizens are reacting to the incursion.