Under the heading of "Coming Events":
I will say, yes indeed the assaults on Crimea and the underperformance of the Black Fleet, have Putin wringing his hands plenty, BUT.....
Even worse, is the fact that Putin knows that both he and the Ukrainians are now/soon focusing on the heretofore unthinkable- and that is the main bridge leading from the east side of Crimea into Russia- their major supply route in addition to the rail lines up in the donbass- what's left of them.
This was not even conceivable just a month ago but since then the Ukrainians have received longer range missiles, and it has clearly been established that the Russian air defenses cannot even protect Sevastopol which is the home port for the Black Fleet. Each missile they fire into Crimea gives them more information about the performance of their missiles, and about the strength and weakness of the air defenses. At some point all that information is going to come together for the Ukrainians and result in a strike on that bridge, which is the jewel in the crown of all the bridges in that area- and it is Crimea's lifeline. Not sure whether they have rail on that bridge as well. Probably.
And yes, as with the other bridges, a strike on it would probably only pockmark it, but the psychological trauma to Putin would be major- especially since he would know, as with the other bridges, "it can be revisited" as needed.
I don't think the Ukrainians are ready just yet, but how can I know. They have one set of missiles one day, and then another next week these days. Ukrainian Independence Day is coming up next week. You never know when they will decide to send that "gift" to Putin. But it's coming at some point.
Guaaaronnnteed, as they say in Louisiana.