The problem is that only the US has a good number of capable AD ships (our Arleigh-Burke destroyers). And for whatever reasons we’ve only deployed 4, usually with one of those on any given day needing to make a run to resupply...
There are ships from several other countries assisting in various ways — Ward Carroll and “What’s Going On With Shipping” (see below links) have posted long vids about the situation in the last day. Lots of info. there! But even WGOWS agrees we need quite a few more of the Arleigh-Burkes there to be truly effective, and even that defense would likely be penetrated once in a while. 100% AD is nearly impossible.
https://www.youtube.com/watch?v=PCLFXkTUNS0
https://www.youtube.com/watch?v=P5AtpKOp7Qs