One of them that will, or at least should be able to continue, is scuttlebutt. Scuttlebutt clients on an isolated LAN can share messages with each other. To go beyond the LAN, you point at a "pub server", which anyone can host anywhere. Yes, only russian-based pub servers will be available, and that assumes they are using russian based DNS to point to them (or have a known static IP). However, for the test of communicating within your region, scuttlebutt will hold up.
The protocol, clients, and pub servers (which are really just automated clients) are designed with an offline-first approach, then local, then regional, then global. Messages are copied between clients as they come into contact with each other. One way to visualize it is by picturing islands of people gossiping locally, and then having ships carry that scuttlebutt from island to island.