In a cafe lounge at the United Nations complex in Geneva, a Tibetan fugitive was waiting his turn earlier this year to tell diplomats his story of being imprisoned and tortured back home in China.

The 43-year-old Buddhist monk, Golog Jigme, had broken out of a Chinese detention center in 2012, eventually fleeing to Switzerland. But his Chinese government pursuers had not given up.

As Golog Jigme prepared to testify in March before the U.N. Human Rights Council, a senior Chinese diplomat, Zhang Yaojun, was in the crowded cafe. Zhang stood just a few meters from the table where the bald monk was seated in his saffron robes.