Yes, significantly so. The whole point of NATO not being directly involved is to not escalate things (and that Ukraine isn't part of NATO). If NATO was directly involved and fighting Russia, the invasion likely wouldn't have lasted long, and Russia would have been defeated after maybe a few months.
My guestimate would rather be "after a few weeks", if not days.
Russian military really is no match for NATO or US armies.
Very poor training and far too much corruption within the military apparatus. Plenty of the funding for the military disappears in the pockets of the chain of command and never finds its way towards proper training facilities or weapon maintenance.
They have numbers, but that doesn't make them a match to the highly trained, highly professional and armed to the teeth with state of the art weaponry of NATO personnel.
In a ground war with boots on the ground, the Russian army would be completely obliterated very fast.
The biggest challenge to fighting Russia is that the Kremlin doesn't give a hoot about the lives of their soldiers. They'd happily spray the front line with napalm or alike, burning both enemies as well as their own soldiers. And the biggest threat, off course, is that they would go nuclear.