Ring locks suck, a lot of them can be defeated with a pair of scissors. Similarly, U-locks suck because they're never as strong as the bike frame. You can just pick up the bike and use the frame as lever and the streetlight pole as fulcrum, twisting the bike around until the locking notches of the U-lock snap.
Occasionally, in The Netherlands professional bike thieves will drive up with a stolen van at night and load up entire bike racks. Not much you can do against that except store your bike inside.
Funny side note, the cops actually offered to let me setup the sting, make contact with the thief and pose as a buyer. I was sure they’d sternly recommend I do not get involved, so I was very surprised, but it was a busy night when I called and they had no officers immediately available. I did make online contact, but due to delays setting up the meet, the cops ended up handling it without me, and when I went to pick it up they were rightfully very proud of catching the guy and being able to return the bike to me.
So I did that, showed up. No other people there. Person behind the counter told me they were too busy, and I'd have to show up some other (unspecified) day.
So yeah, I'd like to trade PDs with ya.