Any serious consideration for Nato membership will almost certainly trigger an abrupt return of Russians back into the Baltics. They are also decreasing as percentages for several reasons. First, especially in Latvia the Russian population is older including many retired naval personnel. Second, as commerce and government are almost entirely done in native languages now, the Russians must either adapt or leave. Third, the Baltic diaspora inside the former Soviet Union is returning.
Regional websites are either in Baltic languages or English.
A gigantic Russian slum like Daugvapils is disappearing. Russian ground forces do not frighten me. It is not in anything resembling the ability to run a ground campaign except against a few gangsters. Even the small but modern and highly motivated Baltic militaries would stretch its limits. I would remind you of the Russo-Finnish campaigns of 1939 and 1940 where although Finland eventually lost the costs to Russia were certainly enormous.