You're referring to the Russian Association of Indigenous Peoples of the North, commonly known as RAIPON. Their constitution apparently conflicted with Russia's and they were required to make an amendment to their constitution to comply with the country's constitution. In that case they were suspended from any activities until the assembly could hold an emergency meeting to consider making that amendment.
The Russian representative is supposed to be providing the Arctic Council with an update in a couple of weeks when we have our next Arctic senior officials' meetings on that status.