Russian strikes in Ukraine’s eastern Donetsk region have killed 11 people and injured 37 others. It comes as Ukraine’s incursion into Russian territory continues into its fourth day, with Russia declaring a state of emergency in its Khersk region. The World’s Host Carolyn Beeler speaks with John Nagl, professor of warfighting studies at the US Army War College, about the logic behind Ukraine’s incursion into Russian territory and how this can be understood by Ukraine’s allies.