But they are in NATO and the EU, so they appear to be safe. Russia invading Estonia would give the US and other NATO powers effective free license to start hurling missiles themselves (instead of just handing them to Ukraine).
Don't get me wrong though, I have a high opinion of Estonia: https://en.wikipedia.org/wiki/Estonian_Genome_Project
I'm not sure on the timeline - but Finland will soon be a NATO member.
I don't think Finland has anything to worry about.
Moldova, maybe. George - not being a border state with the EU - definitely.
They frequently make statements that can be construed as threats to EU and NATO states, eg. some jackass in the Duma saying they don't recognize the sovereignty of the Baltic states. A few years ago it seemed like it might not be a bluff. And with Donald Trump openly bashing NATO... It would have been conceivable that Putin could attack and assume the west wouldn't care.
But the Ukraine conflict made it clear that it's not possible. The west cares, and the Russian military is pretty weak.