Jiske Lathi uski Bhens.
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An insightful comment. In spite of demarcated borders and McMahon lines the Chinese will probably not hesitate to seize and claim land that is not defended or has strategic or commercial value.
We can do the same and may be doing a little bit. The problem is that unless the land / feature has strong strategic value it does not pay to station soldiers to watch over it. So one walks over, spray paints messages and then leaves. The key is to prevent the Chinese from building infrastructure that will enable them to threaten our soldiers at short notice. Based on what I read here we have the advantage in men and supply lines to enforce that.
Should they succeed in building a threatening road or whatever, let us destroy it when unguarded - or even when guarded if sufficiently threatening. Do not let them develop any additional logistical / terrain advantages. The chicoms have already shown the way for that response by being the first to invade (1962) an by destroying our bunkers (recent years).
The chicoms have refused to demarcate the border for decades. Let us now use that to our advantage. AND we should now refuse to agree to a formal demarcation. We now know that the chicoms do not respect borders. Jiski lathi, uski bhains (might is right)
Also use and develop low cost technology - satellites, drones, robotic surveillance, sensors...