No constant friendship between Russia and China just like no constant idea you have about China-Russia relation.
Putin knows bowing for he is a high ranking player of Judo.
Post-disaster rebuilding of a divided Nepal or another Indian state.Sikkim to be an India state 4 decades ago you know,just 1 year before another devastating earthquake.
The borderline then be pushed forward to the plain area for China to face India directly.
We own the whole mighty Himalaya and Indian to take a look at any time.
Tawang itself not so good,just some places nearby it to the northeast and northwest which ones being called 'hidden paradise' respectively should not be neglected by Chinese.There is still no borderline formal and each side had opportunities to do something.