there any reason that Ukraine cannot attack and sever the land side rail line and roads
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An excercise in futility. Rail lines ( announced by both the Ukies and Russians) are quickly repaired , usually within a day. I have viewed video that shows railroad repair units in action fully restoring severed rail lines in a few hours.
Fact is, Vlads extensive fortifications built and supply lines to his eastern provinces insures they will remain in his hands. While the Ukies were fiddling around with there infamous failed counter offensive, Vlad was fortifying his Kherson Zaparhoznia regions. It should be noted Vlad has regained all of that territory the Ukies entered, and managed to open a northern front.
The US’s Project Ukraine has failed.
Rail lines are robust but by no means invulnerable, especially if rail traffic is prioritized and repair crews themselves are attacked. Russian confidence in their ability to win in the end is misplaced.