The operation had a chance to become fast, but very small. Ukraine is the largest country in Europe, after Russia, it is much larger than Germany or France.
Your excuses for Russias military failures aren't true, and even if they were, don't make sense.
If you include Crimea and Donbass, Ukraine is only slightly bigger than France.
If you don't consider Crimea and Donbass as part of Ukraine, France is actually larger.