NATO's defence strategy has changed
It used to be that they used deterrence by retaliation - meaning the Baltic countries were considered trip wires and it was always expected they would be quickly overrun by Russia before the US arrives and liberates the baltics again.
But due to the way Russia has waged its war in Ukraine and seeing the complete flattening of cities and war crimes inflicted on people, the trip wire strategy is no longer morally viable.
So NATO is switching to deterrence by denial - meaning NATO builds up enough forces on the border of the baltics to stop the Russians from crossing
Shocked by Russian atrocities, NATO is becoming the war-fighting alliance it was during the Cold War, committed to defending “every inch” of its territory from Day 1.
www.nytimes.com