A village leader from Borneo urged Japan on Wednesday to stop building its Olympic stadium with cheap timber that he says is obliterating traditional life for his indigenous people.

Bilong Oyoi, whose Penan people live in Borneo's Malaysian rain forests, handed a petition of 140,000 signatures to Tokyo's embassy in Bern, Switzerland, demanding it halt use of deforestation-linked tropical timber in its Olympic venues.

Japan is hosting the 2020 Games with a wooden latticed stadium, now under construction, as the dramatic centerpiece.