Japan seems to be having more success: https://www.futura-sciences.com/en/this-new-japanese-weapon-can-neutralize-the-fastest-machine-ever-created_17488/ Still, the technical challenges are exactly the same. While I can't find many more details, it being ship mounted is a significant step forward and it seems to imply that some of the more serious issues have been solved. (A demonstration is just a demonstration and anything other than it being able to hit a target ship is just speculation.)