Russia will support and radicalize those.
If the Baltics dont react it will lead to unrest and Russia is forced to intervene and "protect" their fellow Russians.
If the states react this will be seen as suppressing the Russian minorities and Russia will be forced to intervene and "protect" their fellow Russians.
Realistically there's no (strategic) benefit to even defending Kaliningrad in case of a war (and the thing is surrounded by NATO so it would be taken immediately if not heavily defended), so stationing lots of troops there is just a pointless drain on resources. If the Kaliningrad secession movement picks up steam, then they might just let them leave.
