Bhutan said it was imposed for its "sustainable development"
The two countries signed 10 Memorandum of Understandings in the field of space research, aviation, IT, power and education
This is Modi's second visit to Bhutan and the first since his re-election in May this year
The two sides also reviewed the progress of various hydro-power projects in the Himalayan kingdom
Indo-Bhutan relations should not become a casualty