This is speculation, but as an ancient ATC person (early 70s, US army) I would wonder that, as Russians, if you might run into security considerations here in Japan.
Chatting casually might be nice, but certain airfields in Japan are mixed use--civilian and SDF (our local one is)--and I doubt controllers there are allowed to talk to folks like you. "Allowed" might be the wrong word, but there could easily be all kinds of caution flags.
Sorry to point it out, but given the geo-political considerations, this might be a sensitive area.