The consensus within the nuclear proliferation community (at least the community or researchers at the Arms Control Wonk slack channel) believe these to be a te

The consensus within the nuclear proliferation community (at least the community or researchers at the Arms Control Wonk slack channel) believe these to be a test of guided MRVs after a re-entry test. It seems pretty plausible. The hyper-speed, flying in formation, and the shape of the objects - all seem to be plausible for guided re-entry vehicles for a MRV nuclear missile test.