Environmental groups have criticized the project, saying the pipeline could severely damage Lake Baikal, the world's deepest lake and a UNESCO heritage site.
The Eastern Siberia-Pacific Ocean pipeline will cost $11 billion and will pump oil to China and the Pacific Coast.
The Rostekhnadzor environmental-protection agency said today its head, Konstantin Pulikovsky, had signed a positive assessment of the project. An expert commission gathered by Rostekhnadzor had initially rejected the plan.
President Vladimir Putin has said the Eastern Siberia-Pacific Ocean pipeline is a priority project for Russia's social and economic development.
(Reuters, ITAR-TASS)