CHICAGO — As Russian troops and bombs descended on Ukraine, the daughter frantically booked a flight from Chicago to Warsaw, Poland, to help her parents fleeing their home in Kyiv. Her 78-year-old mother and father earlier this month escaped the war-torn capital with the clothing on their backs and few other possessions. Explosions rocked Kyiv overnight. A convoy of Russian military vehicles said to be 40 miles long was headed into the city. Security checkpoints dotted the route west, further slowing the traffic already congested with thousands of cars. Brutal media images of Russian shelling …