TOKYO, June 12 (Reuters) - Japan is considering a new sanction on groups including Chinese companies for supporting Russia's invasion of Ukraine by supplying materials that can be used by Moscow's military, national broadcaster NHK reported on Wednesday.

Japan's Prime Minister Fumio Kishida may explain a plan to add such Russia-supporting groups in third countries to its export ban list in the upcoming Group of Seven (G7) Summit in Italy, NHK said. (Reporting by Kantaro Komiya; Editing by Jacqueline Wong)