Understanding 'Tripwire' Deterrence

tripwire deterrence during the Cold War:

https://en.wikipedia.org/wiki/Tripwire_force

NATO's tripwire deterrence via the 2016 decision to establish the Enhanced Forward Presence (see sections 25-30):

https://www.nato-pa.int/download-file?filename=sites/default/files/2018-12/2018%20-%20DETERRENCE%20IN%20THE%20EAST%20-%20DAY%20REPORT%20-%20168%20DSC%2018%20E%20fin_0.pdf