This is a Significant Operational milestone.
The Mi-24LL PSV technology demonstrator (based on a Mil 24) was fitted with composite technology blades with advanced tip planform (see Russia and China Show Latest Aircraft, VERTIFLITE November/December 2015, Page 10). It first flew in Dec 2015.
Note: The date of this milestone is the date on the original source report (Interfax). This will be amended as and when more accurate information becomes available
Source: "Russia Sets Unofficial World Speed Record", AHS news release, Nov 8 2016