In our latest Q&A with military analyst Michael Clarke, he was asked how Ukrainians are surviving the harsh weather and if attacks on the energy infrastructure amount to a war crime.
Temperatures in Ukraine have dropped as low as -20C this winter, with national forecaster Ukrgidromettsentr predicting another cold snap will intensify next week.
At the same time, Moscow has relentlessly attacked Ukraine's energy infrastructure, which has cut off heating, electricity and water in different parts of the country, sometimes for days on end.
Clarke said whether it constitutes a war crime depends on the intention.
"In other words, it's automatically a war crime to try to make civilians suffer in a war," he said.
"It's a war crime if the intention is anti-civilian, which in this case it certainly is, I don't think the Russians could possibly defend themselves on the basis that this was in any way military related."
Our security and defence editor Deborah Haynes spoke to families in Kyiv this week who are struggling in the harshest conditions....