Fix, to document evidence, but we re here in ukraine and actually understand who is responsible for all of this. reporter: the investigators work is complicated by the fact that the war is still going on, and they can t reach many devastated areas like the encircled city of mariupol where ukraine s president says tens of thousands have been killed. but irina venedictova said no matter how long it takes, she will press on. it s extremely important because if we will be successful as prosecutors, i assure that we can stop such aggressions in the future. reporter: fred pleitgen, cnn, bucha, ukraine. well, tuesday marked day 48 since the russian invasion began, a point not lost on the ukrainian president. in a speech posted online, zelenskyy made reference to moscow s plan to encircle and capture the capital kyiv in just 48 hours. listen to this.
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