3/15: Russia intensifies attacks in Ukraine. Arrest in string of shootings targeting homeless men.

We are now 20 days into the war in Ukraine. Ukrainian officials say more than 2,500 civilians have been killed in Mariupol. So far Russia has failed to take the city, on the country's southern coast. Russian forces have also been advancing on the capital, Kyiv. Last night, an editor for one of the Russia's state-owned channels burst onto the set of the nightly news broadcast, shouting "stop the war." CBS News has learned President Biden could soon be heading to Europe -- to meet with NATO allies. Meanwhile, Ukraine's President Zelensky is expected to address Congress tomorrow -- as part of his effort to mobilize international support against the Russian invasion. A suspect has been arrested in a string of shootings targeting homeless men in New York City and Washington, D.C. CBS News has learned about a surge in child exploitation. We are learning troubling new information about the online dangers to children who have been spending more time in front of computers during the pandemic.

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