Iraq was defended by more than 15,000 Surface to Air Missiles, 1,000 AA installations, 2,000 fixed AA guns, 6,000 mobile AA guns all linked together to very advanced ADS with more than 500 early warning radars. The night before Desert Storm, Iraq was the most heavily defended country based on size.
In the opening hour of the coalition air assault, as many as 2,000 various fixed wing aircrafts were airborne at the same time. Back in 1991, the US multi-branch coordination was so well planned that USAF B-52s flying non-stop from Louisiana (11,000km), Pave Lows carrying Delta Force operators and Tomahawks fired from submarines in Gulf reached at the same time. In a matter of hour most of the ADS, C4 centre, airbases and safe hoses had crumbled.
Element of Surprise, Speed of Attack and Violence of Attack...this is perhaps the ABC in terms of Principle of War. Back in 40s, Rommel was using this. We used this not once, but twice in 1971.
Russia has done everything from carpet bombing, strike on civilian infrastructure, bring back antiques, use of MRBMs, air assault, using NoKo mercenaries...but in almost three years of engagement Russia has failed to use the very basic principles of war; swift decisive action. Things become even more pathetic when you consider...
...it's the third strongest military
...it shares a land border with Ukraine unlike say USA and Iraq or India and Karachi
The problem is when people start walking backwards in a bid to avoid Western propaganda, they don't realise that at some point they'd walked into Russian propaganda.