The bank, its counterparties, trades and payments are made up, as are its customers except two that carry the names of real entities on the sanctions list. The list is the US Treasury's real one; exchange rates move around the ECB's real daily rates.
This page sends the trade to the control room as a private task: a worker of its own adds it to the counterparty's current exposure, at today's exchange rates, and says what it does to the limit. Its results come back to this page only, and nothing is booked or shown to anyone else. Change the trade and send it again to replace it. Leave the page and the task and its worker are removed.