By Michael Kahn KRAMOLIN, Czech Republic (Reuters) – Alisa Artiukh and Yuliia Boiko sheltered underground for two weeks in the decimated, besieged Ukrainian city of Mariupol before braving the fighting to flee on foot when both food and hope for their young children’s future ran out. Carrying only water, cookies, clothes and a ukulele, the single mothers walked with their two boys out of the city, past landmines and dead bodies, to start an eight-day journey that took them to safety in a small Czech village. “We decided if we die we were going to meet it in the face instead of hiding,” said Ar…