no indian army cannot protect north-east from falling to china if actual war happens today.......we are lucky that china at present focused on economic prosperity and super power status.....that is why china is not attcking india.....but who knows what will happen after 30 years?.....after attaining super power status they may focus on settling territorial disputes by military force after 30 years.....all indians may have to prepare from now itself for a future sino-indian war