Japan is brokering a joint statement on the South China Sea ruling with its counterparts in the Group of Seven (G-7) advanced economies as part of a "proactive diplomacy" drive, though its own reaction to the verdict tomorrow may be muted.

China has warned the Group of Seven (G7) countries against engaging in talks that might worsen tensions in the South China Sea, as leaders of the seven economic powers meet in Japan.

World leaders meet in Japan this week for talks that will encompass the slowing Chinese economy and China’s reclamation of land in the disputed South China Sea -- without any representatives from Asia’s largest economy at the table.

Foreign Ministers from the Group of Seven leading economies expressed concern over territorial disputes in the East and South China Seas where China has been more aggressively asserting its claims in recent years.