How Putin's previous military successes set the stage for Russia's invasion of Ukraine
Chris Miller, an assistant professor of international history at the Fletcher School of Law and Diplomacy at Tufts University, joined CBS News' Catherine Herridge to discuss how Russian President Vladimir Putin's previous military successes portended the 2022 invasion -- also the subject of a recent article he wrote for "The New York Times." Miller also discussed the U.S.' role in the conflict and how the state of Russian economy, and his 2018 book "Putinomics," could potentially affect the war.