Ukraine's power supply close to critical as Russian strikes bring darkness and cold

Daryna Kulchytska is a mum under pressure. A single parent in a seventh floor flat in Kyiv trying to feed two lively kids and ensure they do their homework. But Daryna also faces the added strain of a deadline she can't even be certain of.

All she knows is soon the lights will go out, the sockets will lose power, the wi-fi will drop, and the taps will run dry. Tonight, the electricity has kept flowing an hour longer than advertised, but Daryna's still racing to serve dinner and finish her own work from home. "The last few days it was only four or five hours we had power, but it's not at the same times.

For two hours we have electricity, then for eight hours we don't." This rolling schedule of planned power cuts has been in place since October, as Russia intensified attacks on Ukraine's energy grid. Ukraine has responded by striking Russian oil refineries. Officials are concerned that life will quickly become unsustainable for millions of Ukrainians if power supplies cannot be maintained for at least four hours per day.