Western countries don't have so much hardware, but they have much better hardware. Simply put, if NATO entered the war, Russian air force and land bases would get eradicated from safe distance, thanks to aviation and missiles Ukraine doesn't have.
Our war games don't seem to paint a very rosy picture, and we barely have any manufacturing capability left.
Sink a carrier or two and what are we left with? Nukes, long range bombers, airbases... could we even mobilize enough to defend and hold Europe if the reds invade?
Also, a huge problem with modern Russian hardware is that it’s largely vaporware. That’s why they are using all that USSR-era equipment.