The war in Ukraine illustrates very well the difference between perception and reality. Perception counts for deterrence.
It's already quite clear the US has virtually left NATO, at this point they wouldn't assist at all with a landgrab in the Baltics so I'm glad the EU defence treaty is more forceful about the level of aid/assistance than Article 5.
NATO at this point is virtually dead, there's no trust in the USA and the rhetoric about Greenland has cemented it. Hope the Canucks can join a defence pact with the EU, the Trump admin and its Project 2025 achieved what they wanted.
Currently that entails "large drone attacks" that kill two and injure dozens.
That's a little short of the full scale war Russia could wield in WWI and WWII.
This seems like quite the assumption.
It is generally a mistake to attempt telepathy/IP.
Russia not doing nearly as well as one might expect for an aging out core of a former superpower is not an equivilance with their target is kicking their arse.
The grind Russia is having to go through against Ukraine is an indicator of how it might fare against a full NATO (sans the US).
I am sorry to say that we (Europeans) increasingly do not believe that the US would help us.