What about more limited restrictions, like not letting out of the country people who received conscription/mobilization notices (which happened last year I believe). Would it have counted as "significant" for the purposes of this question?

@OlegEterevsky In this example no, because it doesn't require new rule or policy and already happens.

@ProjectVictory I mean, if something like this happened after the question is asked, would it qualify as significant?

@OlegEterevsky Yes if it is both a new policy/law and designed to target large group of people (conscripts would count, professional chess players would not).