"I still find it stressful to stay outside, in the open, for long," says Ira, a 41-year-old accountant, before heading down a dark flight of stairs and into the cramped cellar of 6 Railway Street.Despite heavy fighting continuing in the Donbas, civilians are trickling back to liberated Ukrainian towns close to the front line - against the advice of local authorities. In Lyman, devastated by Russian forces last year, some 13,000 residents are living, precariously, in gruelling winter conditions.