Ukraine has effectively repelled Russia because it's the second biggest military in Europe after Russia, and second strongest air defence in Europe after Russia.
This is the sole biggest factor without saying which, everything else is meaningless.
It's mainly because the attrition rate should have entirely depleted the S-300 system in the first 6 months (2-3 per week during the main phase).
Ukraine is a big country and there were loads of missile attacks to defend. It's very unlikely it was able to move S-300s continuously into needed areas compared with manpads.
Yet it would have been a PR disaster if NATO admitted to supplying weapons to Ukraine before the invasion started. So MANPADs are implied to have sprouted like mushrooms in Ukraine...
Enough to shoot down each other's airforce a few times over.
> Yet it would have been a PR disaster if NATO admitted to supplying weapons to Ukraine before the invasion started. So MANPADs are implied to have sprouted like mushrooms in Ukraine..
You can’t be serious, NATO openly delivered MANPADs and vast amounts of other munitions before the war started https://www.armyrecognition.com/defense_news_february_2022_g...
https://www.dw.com/en/russia-ukraine-crisis-who-supplies-wea...
Maybe try to learn some basic facts about the subject before commenting?