Estonia and other nations which make up NATO's Eastern Flank, along with the alliance as a whole, have a three-year window in which to avoid war with Russia, according to the head of Poland's National Security Bureau (BBN). Other expert estimates from European NATO member states put the time-frame at between five years and a decade.
Sure, but what would that even look like in practice? Russia would be staving off a protracted insurgency that could last years. We know from Afghanistan that they don’t do the best with insurgents (who does though?). It’s certainly possible, but it’s not the outcome I’d bet on.