Let's say you have two possibilities:
The first change in the .icon file the icons to be assigned to the shell service station:
Spoiler: EX
[Petrol_Station.Shell]
TEBOIL_mapdistant.svg
TEBOIL_map.svg
TEBOIL_normal.svg
TEBOIL_normal.svg
TEBOIL_disabled.svg
TEBOIL_normal.svg
TEBOIL_disabled.svg

[Automotive.Petrol_Station.Shell]
TEBOIL_mapdistant.svg
TEBOIL_map.svg
TEBOIL_normal.svg
TEBOIL_normal.svg
TEBOIL_disabled.svg
TEBOIL_normal.svg
TEBOIL_disabled.svg


The second, take the TEBOIL icons from the archive, rename them in Shell and insert them again.

However, keep in mind that this change applies to all of Europe and not just to Russia.