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i'm charlie d'agata in kyiv, where a swift russian victory turned into a devastating conflict with no end in sight. plus, new fallout following the toxic train derailment in ohio. >> we've got a lot to do to fix this, to make rails safer. back to class. michigan state university moves forward as it begins to heal from last week's mass shooting. and later, insights from our own bob schieffer on covering the nation's 39th president, a period of american upheaval and a leader determined to go his own way. >> telling the truth has been pretty deeply ingrained in me. >> announcer: t...

♪ very good wednesday morning to you, i'm jim sciutto. >> and i'm erica hill. happening right now, more than 4,500 civilians are stuck in the ukrainian city of bakhmut, this as russian forces launch a barrage of attacks on the fiercely contested area, president zelenskyy calling it the country's most difficult situation. as of now, though, ukrainian forces are still holding the line. cnn is on the ground in eastern ukraine and we will bring you the very latest. plus a political -- >> sorry, go ahead. >> it's all yours. >> plus a political shakeup in chicago. mayor lori lightfoot...

eighty one . biden were to serve a secondll full term as president. be 8ould be eighty six years old. in other words6 years , four yem ninety . >> these are not trivial facts9e about joe biden. these are the central facts of joe biden's life. joe biden's age defines him and all of us . that's true for every person, age is just a number you'll hear people say, but they are lying to themselves is moree ism than a no ages an expression of the core biological reality ofee human existence, which is thatit at some point it comes to ae. close ages, the way that weas w chart a progression fr...

>> tensions in the skies, a russian fighter jet forcing a u.s. drone over the black sea. the u.s. air force calling the encounter reckless and unprofessional. it's at a potentially dangerous escalation at a crucial time in russia's war against ukraine. joining me now from the magic wall is cnn military analyst, retired air force colonel cedric leighton. i'm so glad you're here to help us unpack. what happened in this moment? now, colonel, officials are saying that this drone was over international waters on the black sea when a russian jet dumped fuel on them and bumped into the dron...

>> good evening, welcome, i'm earth nature. just ahead on cnn newsroom, russian warplanes are accused of taking down a u.s. drone over the black sea. it's a potentially dangerous escalation at a critical moment in moscow's war against ukraine. we are tracking two major coastal storms in the u.s.. more flooding in california, and a nor'easter dumping feet of snow in new england. plus, coming soon to florida beaches, a giant blob of stinky seaweed. around twice the width of the united states and visible from space. i'll speak to a leading researcher about the dangers it poses on sea an...