As far as logistical hubs go stopping Russian use of the rail section of that bridge should rate highly as it forces all military and civilian traffic into Crimea onto vehicles and that would be one hell of a traffic foul up.
I am proposing hitting just the rail bridge so as to increase Russian maintenance requirements (fuel, vehicle deterioration, logistics personnel numbers) as far from the front as possible on top of that they will still have to feed and convince the population of Crimea that everything is under control and running to plan.
Another article I found interesting regarding the reasons for the war...
https://historynewsnetwork.org/article/183514