A Ukrainian serviceman looks on as he waits in a trench at the front line east of Kharkiv on March 31, 2022. - Russian forces are repositioning in Ukraine to strengthen their offensive on the Donbass, Nato said on March 31, 2022, on the 36th day of the Russian-Ukrainian conflict, as shelling continues in Kharkiv (north) and Mariupol (south). (Photo by FADEL SENNA / AFP)