Didn't see this posted elsewhere.
https://www.theoutdoorwire.com/relea..._K8O5g9BK3-nWc
"In a continuous effort to promote interchangeability of all small caliber ammunition used by allied armed forces, NATO has recently finalized the standardization process of the FN®-designed 5.7x28mm caliber by approving the standardization agreement (STANAG) 4509."