mikhael federov is a vice prime -- nick: mikhael federov is a vice prime minister and the minister ofransformation. he invited us into his millennial hster office. federov was born in 1991 -- the same year post-soviet, independent ukraine was born. before the full-scale invasion, federov led the government's efforts to modernize with technology. >> ukraine is the first country in the world to equate a digital passrt with a physical one. nick: especially using an app called diia, that stores all ukrainians' documents. today, the app is a wartime tool, how victims of russian bombing document damage, and receive direct government assistance. federov says digitization can also help fight ukraine's domestic enemy -- corruption. mr. fedorov: it's a different approach to governance. and right now, everybody is reacting very quickly to any problems we have in the governnt. nick: earlier this month, ukraine's equivalent of the fbi launched its largest wartime corruption crackdown. they accused the head of kyiv's tax service of embezzling millions. and th arrested a deputy minister of defense,

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. >> reporter: at the shelter, they were joined by pablo federov, who says he left his dentis recoveryn act of defiance and a war that has become a threat for everybody. >> for man especially at 18 to 65, this is soldier. no immigration. no pass. stay in russia. too much people in georgia, armenia, mongolia. >> reporter: the first months of the war, russian men fled in droves to neighboring countries like georgia. some russians have decided safety can only be found on this side of the world. the migrants staying at the shelter in reynosa are three among tens of thousands who have made the long trip in the last year after the invasion started. many have applied for asylum and say they hope to build a new life in the united states far away from the war and putin. according to u.s. customs and border protection figures, the number of russians who crossed the southern u.s. border last fiscal year when the ukraine invasion started grew by more than 430% compared with the year before. back at the shelter, reflecting on the hard decision he had to make. >> very difficult. i have daughter. wif