In her Soviet-era apartment block on the outskirts of eastern Kyiv, Oksana Zinkovska-Boyarska lives with daily power cuts. The lift to her eighth-floor apartment often stops, the lights go out and sometimes the pumps maintaining pressure in the gas central heating fail. She has a big rechargeable battery pack to keep appliances going, but it costs €2,000 (£1,770) and it only lasts so long. Her husband Ievgen, a lawyer, often has to work by torchlight. Their two-year-old daughter Katia plays by