Is it possible to connect openziti networks ?

Can services hosted on a self-hosted instance be reachable from the NetFoundry's zrok instance?

Is it possible to connect openziti networks

Not directly - zrok's ziti network is independent from your self-hosted network. One endpoint could have identities on both networks, which you could use to bridge networks.

Can you share more about the use case your trying to accomplish? Does your self-hosted network include self-hosting of zrok, or is it an OpenZiti network without zrok deployed?

I use NetFoundry's zrok instance. However most of the routers and controllers are on AWS.

Very likely, Russian censorship will block entirely AS16509 and AS14618 (*.amazonaws.com). So my friend who lives there will not be able to connect.

I am thinking to install a self-hosted zrok network on a small and very little known VPS provider in Europe. I expect to have one or two users.