Moldova has a separatist area maintained by Russian troops. Transnistria. So in a way Russia has already attacked them, though not yet tried to conquer, yet. Also Moldova shares no land border with Russia, yet (and very much hopefully not).

Finland is the only land border sharing non nato country left.

What makes you think Russia would invade Finland? I seriously doubt that would happen.

I recommend reading some material about https://en.wikipedia.org/wiki/Foundations_of_Geopolitics

It's very influential book in Russia that has influenced their policy goals. It was written in 1997. A lot of it feels rather prescient considering the current world situation, which is likely not a surprise.

What they considered for US was that they should "introduce geopolitical disorder into internal American activity, encouraging all kinds of separatism and ethnic, social and racial conflicts, actively supporting all dissident movements – extremist, racist, and sectarian groups, thus destabilizing internal political processes in the U.S. It would also make sense simultaneously to support isolationist tendencies in American politics"

UK was to be cut off from European politics and Germany should be the new lead of central Europe. Well, UK did distance itself. And up to few weeks ago Germany was the one most against united front against Russia.

There is plenty of other stuff there. Annexation of Ukraine is just one of them (alongside annexation of Belarus which they have de facto achieved). Annexation of Finland is one of the goals too. Hence I have no doubts that it would happen at some point.

*invade finland again

i think it’s unlikely, too, but if the past few weeks have taught us anything, it’s that russia likes to repeat its past conquests