The UK practically sent their entire stockpile of SPGs to Ukraine thus have gutted their military to nil and Poland thrown half of their stockpile of SPGs to Ukraine for example. Russia is producing more artillery shells than the entirety of Europe combined according to pro-Ukraine sources. Almost every European country has complained about massive shortages of ammunition due to it all being given to Ukraine. France stated they could only fight Russia for a few weeks before running out of ammo. Other European countries have stated similar things.

With most of Russian Armed Forces not even being in Ukraine, as majority of forces in Ukraine are from irregular volunteer formations recruited from regions across Russia, I think this can only backfire.

Even the Americans are warning against underestimating Russia.