This week on "Sunday Morning" (March 20)
CBSN
Host: Jane Pauley
HEADLINES: The latest news from Ukraine
HEADLINES: Why Russia's tank war stalled in UkraineAs the Russian invasion enters its fourth week, Ukrainian resistance has so far foiled Vladimir Putin's plan to take the capital of Kyiv with a lightning strike using his vaunted tank army. CBS News national security correspondent David Martin talks with Gen. Frank McKenzie, commander of CENTCOM, about why Russia's tanks have failed – and what it means for Ukraine going forward.
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