I usually avoid posting here as I see far more intelligent people on this forum. Since you asked for conjecture... I'd recommend Caspian Report's video [1] first. Secondly, if we look at Cuban missile crisis, US had a strong reaction to missiles around them. I see the Russian reaction pretty similar. They do not want NATO expansion and they do not want missiles in Poland. [1] ▶ this video
in “Estonia, allies to trigger NATO Article 4” · View on HN