I understood that as a result of CAA enquiries brought about by a Yak pilot's airspace infringement, the Russian authorities gave the CAA information about Yak certification which left them no choice but to take the action they did. I don't think the CAA considered it a safety issue.
But I note from the magazines that certain Yak dealers seem to to be implying that it 'will be a good thing' since it will put Yak maintenance 'on a level playing field' - whatever that means.
SSD