As airstrikes raged in Ukraine signalling the arrival of the Russian invasion on 24 February, Oleh Derevianko was dismantling a top floor office in Kyiv. There were no movers to call or couriers, so while the “real fight” was happening at the outskirts of Kyiv, and shelling and explosions were audible, Derevianko continued unscrewing and packing up hardware equipment which was being moved to relative safety in Western Ukraine.  The founder of Information Systems Security Partners (ISSP), a cyber security firm based in Ukraine but with seven offices across Europe and North America, Derevianko is an expert in cyber warfare…