Russia Warns U.S. of “Unpredictable Consequences” if it keeps arming Ukraine 4/15/22

In a stunning confirmation for Ukraine, the Pentagon says it was the Ukrainians who sank Russia’s top warship, not an accident that the Kremlin claimed as the cause. Ali Arouzi reports live from Lviv in western Ukraine as Russia unleashes cruise missiles on the outskirts of Kyiv. Plus, Twitter announces it’s adopting a so-called “poison pill” -- a countermove to fend off Elon Musk from increasing his stake in the social media company. Also, a medical mystery in New Jersey after nearly 100 former staff and students from the same school were diagnosed with a rare type of brain tumor. NBC speaks with some of the survivors and some people who lost family members. And, a big relief for the person who bought what they thought was Tom Brady’s “final” touchdown ball.