Each protecting power agreement is different, but what it comes down to is communication between the protecting power and us. We will ask them, either through informal or formal channels, to carry out a particular consular service for us, for example, to go visit someone in prison, and they will come back and report to us on the results of the visit. That's the most common way the protecting power agreement is implemented.
On October 5th, 2017. See this statement in context.