Arms without targeting are at best areal suppression weapons. Russia's impressive-looking mobile rocket-launcher batteries appear formidable, but their effect seems largely to be producing a few seconds of terror over a few hectares of land.
Ukraine's ability to target individual generals with precision, to distract and destroy naval flagships, to down helicoptors, to drop munitions on or through tank hatches, to land artillery and rockets with precision on massed troops and materiel ... has been tremendously effective. The shot:kill ratios seem to be extremely high.
At the same time, the US has telegraphed Russian moves, plans, and force structures with precision as well.
What the state and source of this intelligence is varies. Part clearly comes from near-theatre sources such as the Poseidon, other AWACS assets, and probably other capabilities in Nato Europe, Turkey (itself both part of Europe and Nato, though notable for its position on the Black Sea and control of the Bosperous). Much all but certainly from satellite observations. And I'd suspect a considerable degree is based on signals intelligence.
Russia does not control those domains, and has been unable to establish clear control within them. This is unlike, say, any major US campaign of the past 30 years, whatever other concerns might have as to their legitimacy, with the exclusion of satellite capabilities. To date, Russia has not felt it has the ability to move against those intelligence assets. It certainly has the ability to do so should it choose, and a more general conflict might result in that. But for now, it is pinned down in a fishbowl.
Effect here though seems to be a combination of intelligence as to enemy position and operations, the ability to deliver force to specific points of need, invulnerability of observation posts, and a general popular support within the theatre of operations. As well as remarkable material support from outside entities.
This will be (and all but certainly is being) studied in war colleges and curricula for generations.