Balbahadur, the situation is much trickier than u  imagine.U cant just go mad against Bharat if Bhutan attacks us  directly or indirectly,because in eyes of the World  its not gonna look OK. There got to be some diplomatic tricks applied in the UN(United Nations)which will pass a bill ,allowing us to Legally declare war against Hindustan via Bhutan if we can prove claiming Bharat is behind 'Bhutan  attack  in  Nepal'   But its gonna be easy because as Hindustan lets Bhutan cross its territorial land to attack us ,the card is on our side at the UN.  For all of us 'Serious thinking' lies ahead