The seven sisters namely: Assam, Meghalaya, Tripura, Arunachal Pradesh, Mizoram, Manipur, and Nagaland... and the list of organizations involved in insurgency against india in these states are National Socialist Council of Nagaland-Isak-Muivah (NSCN-IM)
Naga National Council-Federal (NNCF)
National Council of Nagaland-Khaplang
United Liberation Front of Asom
People's Liberation Army
(Manipur)
Kanglei Yawol Kanna Lup (KYKL)
Zomi Revolutionary Front
and in north india,
Babbar Khalsa
Bhindranwala Tigers Force of Khalistan
Communist Party of India (Maoist)
Dashmesh Regiment
International Sikh Youth Federation (ISYF)
Kamagata Maru Dal of Khalistan
Khalistan Armed Force
Khalistan Liberation Force
Khalistan Commando Force
Khalistan Liberation Army
Khalistan Liberation Front
Khalistan Liberation Organisation
Khalistan National Army
Khalistan Guerilla Force
Khalistan Security Force
Khalistan Zindabad Force
Shaheed Khalsa Force
The northern india is a hotbed of insurgency and the mentioned groups are a huge threat to their internal security. I think my indian brothers need to worry about that rather than to deploy forces to engage or threaten China for that matter... No offense