When Russian strikes cut off the power, heating and water to swathes of the Ukrainian capital in -20C temperatures, Denys Biletsky was prepared.

Following a round of particularly intense Russian barrages two years earlier, Biletsky had convinced his neighbours to chip in together to install solar panels and batteries on the roof of their high-rise apartment block.

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.