KYIV, Ukraine -- The ninth graders had practiced their waltz hundreds of times. Each step, dip, lift and twirl was drilled into their minds. The song they chose, "Love Story" by French artist Indila, had been the soundtrack to their winter and spring. Now it was prom day. It was finally time to perform. The boys wore black pants and white shirts. The girls wore fancy dresses in an array of colors. The room, sticky in the June heat, was filled with parents, teachers and friends.