For Olha Kurtmallaieva, Jan. 31 was a day of dashed hopes. On that day, Ukraine and Russia carried out their 50th prisoner exchange since 2022, with Ukraine bringing home over 200 POWs – nearly half of them were soldiers who had for three months bravely defended the southern coastal city of Mariupol before it was finally captured by invading Russian forces in May 2022. But one particular soldier, from the 501st Separate Naval Infantry Battalion, who Kurtmallaieva had been longing to see, wasn’t among those released. It was Ruslan, her husband, whose last name we can’t disclose due to security …