The Collective "The Bridge: Connecting Past and Present Through Archival Research on Russia" has been very active since Russia's invasion of Ukraine in February 2022 and has become an important resource for researchers interested in archival research related to Russia.
Following the group on Facebook, or Twitter (@TBridgeResearch) can be a good way of keeping up with developments in access to these materials.
There is another facebook group that some scholars are using to arrange to have people resident in the Russian Federation make trips to archives on their behalf: Сходи за меня в архив.