"Khasi from different regions have small, but noted differences. They are descendants of Mon-Khmer speakers who migrated probably from Mongolia to Meghalaya." (Wikipedia)

I am sure Government of India will neither stop or encourage them from leaving Meghalaya for Mongolia.

How are the Khasis "exploited day and night"? They must be incredibly wealthy or incredibly sleepless.

On the other hand, the People's Republic of China has designs on the land where the Khasis ALONG WITH OTHER ETHNICITIES reside and would love to embrace them with as much love as that shown to Tibetans.