I think saving their sons is a more pressing issue than the old-news sanctions.
From a Russian perspective it’s not at all clear that it’s unjust; Ukraine was persecuting ethnic Russians and the initial claimed purpose of the war was to bring ethnic Russian regions back into Russia.
Classic playbook - aggressors always claim grievances: Japan and oil access, Germany and Prussia/Danzig extranational transport corridors, Russia and "oppressed comrades".
From a Russian perspective it’s not at all clear that it’s unjust; Ukraine was persecuting ethnic Russians and the initial claimed purpose of the war was to bring ethnic Russian regions back into Russia.