Arm’s Neoverse V1 and V2 processors are judged to be too high performance to be approved under the Wassenaar Agreement which stops dual-use tech being exported.
Recently Nvidia had to hobble the performance of one of its GPUs for it to get under the performance bar for exports to China established by the US authorities.
The US announced the latest restrictions on export of dual-use technology in October saying, at the time, that there would be a presumption that applications for licences would be refused.