Maybe the "hot" war would come to an end but it isn't out of the question for things to change into tit-for-tat terrorism and counter-terrorism operations for... well... longer than we'll be alive.

If the USA changes its foreign policy goals towards Russia/Ukraine does that mean a total stop of military hardware or will Ukraine be able to skip the USA government and purchase straight from the manufacturers? Will the EU's manufacturing capacity be able to take over the load if the USA's sources are cut off from Ukraine? Will EU's MIC just funnel American sourced weapons/equipment to Ukraine... but with a much larger markup?

How much sway do the EU arms manufacturers have to keep eastern Ukraine a permanent battlefield to make sure all the contracts for future equipment/ammo aren't canceled?

There's a lot of money for a few, probably very well connected people/businesses that could be put in danger if all military operations were to end.