grinding of steel, sounds of the war effort. we have a guy from i.t., an economist, and a mechanical engineer. yeah, yeah. reporter: and now you re making steel traps for russian tanks? yeah, to stop them. reporter: to stop them. that hedge of barricades, and these spikes, their weapons of defense. this frigid yard their foxhole. sviatoslav has signed up to fight, but he s still waiting for a gun. are you afraid? yes, but it doesn t matter. reporter: his wife and 3-year-old daughter are safe in poland. he told his little girl she was going on vacation. she was talking to me. daddy, come to me, please. and reporter: you cried? everything will be okay. reporter: and across town tonight, an art gallery turned into a military workshop. the thrum of hundreds of young people, mostly women, and the