Now Russia has more or less proclaimed it's "back to the empire" agenda which implies subjugation of all of the former states of the russian empire.
Which includes Finland.
The weird thing is, even though Russians lie constantly, when they declare foreign policy targets, they are surprisingly honest and consistent about that.
This implies 1) Finland needs to join NATO asap.
2) After that sweden would be the only weak target left. Gotland is an obvious, concrete military goal that would be feasible target for a RU invasion from Kaliningrad.