In the early hours of 24 February, when Russian rockets started to pound Ukraine, unleashing the biggest attack on a European state since the second world war, Artur, like millions of Ukrainians, grabbed his phone to contact his family.
But while most young Ukrainians were concerned for the safety of their parents, Artur, 27, had a different message for his father, Oleg, a colonel in the pro-Moscow separatist forces in eastern Ukraine.
