Russian authorities have failed to take into account the environmental impact of building work ahead of the 2014 Winter Olympics, the UN has said.
The UN report comes after leading environmental organisations in Russia withdrew their co-operation, saying their concerns were being ignored.
Authorities say the Games will be green and have accused environmentalists of trying to derail the event.
The Games will be held in Sochi, a southern Russian Black Sea resort.
It is a sensitive region - home to a national park and a huge nature reserve designated as a world heritage site. To read full BBC story — Go Here Now.
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