Ukraine does have a large army. 250k soldiers standing and 800k in reserve all are now fighting against a small Russian force of 50k.The Russians are making fools out of themselves, if they can't take out Ukraine how would they ever be able to face bigger forces like NATO?
England for example only has 82k active soldiers. so Russia is leaving around 95 percent of their army at home and 95 percent of their military equipment at home. plus they are not using their proper gear.
So Putin for some reason wants what is going on right now i don't know why.