KYIV, Ukraine — The Ukrainian marine infantryman endured nine months of physical and psychological torture as a Russian prisoner of war, but was allotted only three months of rest and rehabilitation before being ordered back to his unit. The infantryman, who asked to be identified only by his call sign, Smiley, returned to duty willingly. But it was only when he underwent intensive combat training in the weeks after that the depth and range of his injuries, both psychological and physical, began