The Ukrainians took out the Kerch Bridge and the Russians had it fixed in several months in the middle of a war. The Russians are now building a new rail line along the coast of their occupied territory in the Donbas.
I think Zelensky is just waiting for them to finish it, before he starts taking it out piece by piece with moving trains.
After the 1994 Northridge earthquake we rebuilt the freeway overpasses in under 90 days. The governor promised a $1 million bonus for each day that it was completed earlier than projected. I don’t remember what the projected time was, I just know it was done fast and the contractors got a big bonus which was shared with the workers. But these were a major interstates, the I-5 and I-10. They were not as big a stretch as the Key bridge but the point is clear. If it is necessary and desired it can be done.
Now 30 years later they are trying to add a lane in each direction for a 10 mile stretch north of that I-5 overpass That lane project was started during Obama’s first term under his “shovel ready” projects plan.