I carry a Mondanock in EU. Carried one for 13 years on the beat... and spent hours training with them. It's the next best thing to have in a country full of sharp things. Technically, also a no-no. But I've taken it through railroad station metal detectors with no issues. Never been questioned. Fits in a pocket of my Rothco jacket just pretty as you please. Monadanock passes as a camera monopod...
Short of someone with a machete... it's a great device to use against most stabbing implements. A hit from an extendable baton to the head, kidney area or neck is considered use of lethal force in U.S. The Japanese police (who also don't carry firearms( can (and have) killed perps with a single blow from a baton. Then again, they know all that Samurai stuff. Batons in the hands of folks trained to use them are the next best thing to a firearm or a taser. Sure as hell better than a knife against a knife.
And a hickory cane is good... a hickory cane that has been drilled out and had a stainless steel bar fitted into the end... is better!
Though probably won't pass airport security muster...
Cheers,
Sirhr