Yes - Hindus who take up nationality of other nations are no longer Indians. We expect them and want them to be loyal to countries they are citizens of in because that is their Dharma. We will not feel sad that in their line of duty they have to act against India because Gita tells us to do our duty even if you have to act against your brothers. Do you have your answer now ?
You are talking all this bull crap of internationalism because you know you personally have no loyalty to India.
