The next one, though not with much military force, should be Moldova, IMO.
Finland?--They're probably the most prepared state in Western Europe. The Baltic States? They have been such an integral part of Russian history, then the strategic importance of Baltic seaports, no, there, it will not be by more conventional means.
So, yes, a major Finish or Swedish city, probably in the North, to avoid the spread of nuclear fallout by wind, in particular towards Russia.
On the...