From the perspective of "Europe", what actually changed, compared to 2015? Sure, Russia gained some territory, ressources, potential conscripts.
Their army gained valuable combat experience. But have they actually become more threatening to other European nations? I'd argue: Absolutely not.
Russia is not only weakened by their losses of soldiers and materiel, but their non-military options are also greatly degraded-- instead of freely shopping for South Korean battle tanks (=> Poland), they have to make do with North Korean conscripts...
They basically played their whole hand to gain control of another country, but that control comes at a price; Even when the armed conflict is completely stopped, the price for the Ukraine is not yet paid-- switching out from a war-economy will hurt Russia, keeping the Ukraine under control is gonna be another constant drain and their may be significant obligations toward the allies that probably did not help solely out of their belief in the cause (North Korea, Iran).
Meanwhile, European powers got to observe everything as it played out, even got their own weapon systems battle tested "for free". They are forewarned, and arming up accordingly.
I'm honestly fairly confident that if Russia picked an actual battle with Poland alone (no help from any other European nation) in the next decade, that they would walk away with a bloody nose...
So, cynically talking-- "the Wests" plans are affected very little, no matter how this whole disaster plays out...