Bhutan King submited himself and the country to India. India has full control of its water resources and electricity generated from there. Even though india takes 80% of the energy produced and water from Bhutan the remaining 20% revenue is enough for small population of Bhutan to leave Nepal far behind in prosperity. Wang Chuk family is lot more smarter than Shah Bansa....they knew they could not survive without India blessing so submitted to them right away than cause an issue. Similar to what Rana in Nepal submitted to Britishers without much hassel. With that money Wang Chuk has become more popular than ever in his dukpa community. With India's blessing Wang Chuk is also able to throw that many Nepalese out of the country without any international coverage.

It is indeed dangerous to have little knowledge.