>>64038540
>why doesn't Russia just do another invasion from Belarus
They tried it once, and it ended in a disastrous failure and a reckless loss of life and professional soldiers. If Russia starts massing troops in Belarus, allied satellites are going to see it happening and alert the Ukies.
>hy doesn't Russia just do another invasion from Belarus or a amphibious landing from the sea in the south?
Odessa is a fortress now. Russia's initial plan was a naval invasion of the Odessa coast was scrapped due to all the mines out at sea combined with the precoordinated artillery Ukraine had already zeroed in.
>Or even another Air Assault?
Anti-air makes that impossible for both sides.
Everything you're asking, Russia has already tried and failed. Most of Russia's ships are on other side of the Black Sea due to valid fears of Ukrainian drones and missiles. Current Black Sea Fleet is basically combat ineffective. A large Air Assault would result in extreme casualties that Russia can't afford to waste.