NATO officials have released a plan in the instant that Russia was to invade a Baltic country or fire missiles at one according to Bild:
-1st Nato would intercept incoming missiles and begin a massive strike campaign against military infrastructure in particular Kaliningrad whilst also targeting Russian launch points close to the borders of the Baltics.
-2nd If Russia decided to launch a armoured attack on a Baltic state NATO forces would meet these attacks via setting up a grey zone on the border aimed at slowly Russian offences and delivering heavy losses with drones and other autonomous systems first in order to stop the momentum of assaults first and then counter attack with armoured brigades.
-3rd Once an assault was stopped NATO would form an airbridge and begin to target Russian military infrastructure at a long range with missiles and drones deep into the country.