No, RusLine has no scheduled flights out of Dublin. However, RusLine does fly out of Saint Petersburg Pulkovo. 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.
Saint Petersburg Pulkovo is the most popular airport that RusLine serves, followed by Naryan-Mar and Moscow Vnukovo.