No, S7 Airlines has no scheduled flights out of Dublin. However, S7 Airlines does fly out of Kaliningrad. There are also other airline options to choose from if you still want to book a flight from Dublin. Smartavia, for example, is an airline that flies out of Dublin on a regular basis.
Irkutsk is the most popular airport that S7 Airlines serves, followed by Novosibirsk Tolmachevo and Moscow Domodedovo.