China will support for sure is an assumption. On what grounds will it support pakistan when it doesn't follow any international rules on water sharing? Very unlikely. At the most it will ask India to stick to agreed Treaty.See above, China will support for sure and the base of these rivers starts in China as well.
International community will see that India doesn't stick to treaties.
Anyway let's see what modi and his rabid crew will do his been barking about this since 2016 he can keep barking.
Regarding international community, Well, this treaty was brokered and signed atleast 6 decades ago. None of the original signatories are alive. Even the ground realities have changed. Global warming, erratic rainfall, overpopulation etc. I hope the world will take note of this and agree to our reasonable demand.
Regarding Modi, Modi Hai toh mucking Hai. Haters can keep sulking.