Prometheus tortures and tries to break Oliver in the present while in the past Oliver and Anatoly make a move against Konstantin Kovar.
Season 5, Episode 17
Oliver locates Galina Venediktov, Taiana's mother, and asks her for information on Konstantin Kovar.
Oliver, Anatoly, and the other Bratva search the docks for signs of Kovar's activity and find a shipment of nerve gas.
Kovar hosts an event for many important members of the Russian government who he plans on killing.