Sonam Dharwang, Lhawang and Tsering Lhadrup, three businessmen from Kado village in Chonyi township in the restive Driru county, have been sentenced to eight years each in prison after being detained for allegedly refusing to fly the Chinese flag. Tenzin Kalsang, 25, a poet and a native of Sakar village, also in Chonyi, was sentenced to seven years in prison, he had written a book which was denied publication.