I think it's working quite well. In fact, Manitoba first nations erected their blockades long before there was a provincial public health directive. I think that was key in stopping the spread of COVID in our communities and keeping it out. It's been a strict lockdown process with coordination amongst air carriers, people coming in and essential service providers, with assurances that people are screened before coming in and that they're deemed safe.
On May 26th, 2020. See this statement in context.