Lu Jinghua, a well-known Tiananmen activist, was scheduled to attend the April 28 meeting of dissidents and exiles in Dharamsala.
Before the 2014 Lok Sabha elections, Modi had criticised Manmohan Singh's policy towards China and promised a more strong-willed policy. Those claims are now under a cloud.
Cancelling Uighur leader Dolkun Isa's visa could have been a mutual face-saving exercise for New Delhi and Beijing.