China is a factor to consider, but it is doubtful that China would come to the aid of her archival India or try to save the West from its self-destructive decay.
Assistance? For what?
If India cannot handle an assault from ISIS, ALL of ISIS, they have some serious problems. I find that unlikely.
The only two countries where ISIS has been able to make serious inroads are Syria and Iraq. And that was after both nations were ravaged by years of turmoil, leaving no effective military or civilian infrastructure. Has ISIS been able to target smaller nations like Jordan? No.
Its one thing to hack off people’s heads in a war zone. Quiet another to go after a country with a proper form of government. The whole of the Middle East and Pakistan will need to fall to ISIS for it to be a threat to India.