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they're trying to hold every inch of territory in that city. how has that changed the way they're fighting this side? >> reporter: it's made it on the russian side, dirtier. on the ukrainian, more desperate. the last few days as the offensive gains in intensity, as the conditions on the ground worsen, those images geolocated by cnn that showed the conditions around bakhmut pretty grim with mud, making the roads pretty much impassable. what ukrainian authorities and president sens has said tonight is things are getting more and more challengichallenging. what we're seeing are a series...

lab in chiwuhan, china. and in east palestine, the new technique to track contaminated water from that city. and the growing concern to other cities taking in truckloads of contaminated soil. and an image in oklahoma, cnn is on the scene. welcome to "the lead" i'm jake tapper. we start with the groundbreaking assertion with the u.s. energy department that the covid-19 pandemic likely began from a lab leak in wuhan, china. this all comes after the energy department updated its 2021 report with this claim, saying it made the new conclusion, based on new evidence coming to light. tw...