Hmmm. Why do you think that they are on our side?
India has not been an ally of the U.S. in the past, and it's not officially one now although there has been a rapprochement over the last few years. Pakistan is our official major non-NATO ally in that area.
If it comes to picking sides when China invades Taiwan, I am not so sure that India won't choose to quietly support China, not us. Pakistan would likely choose China, no matter what our latest alliance agreement is.
(An interesting hypothetical situation: if we take out Iran, then the balance does change a lot. If we suddenly have a very increased influence over the oil industry in that area, China might well tone down its bellowing.)
Hmmm,India may never have been a past ally of the US,nor has it been an enemy.If you want to know about a pretty interesting phase in Indo-US ties,do a bit of research from the years 1962-late 64.India had just been defeated by China in a border war,where the Soviets stayed neutral & where the US helped,but in a limited sense,given it was tied down with the Cuban missile crisis.After the war,the US increased military aid to India,held joint air exercises(the recent ones were held after 40 yrs!!),trained special operations forces consisting of Tibetans & undertook joint surveillance of Chinese nuke assets(which had just been tested in 1963).At about the same time,someone in Washington had a brainwave & decided that Pakistan was the best bet for the US as most "experts" in the US predicted tthat a democratic & diverse India wouldn't hold together,while a dictatorial & Slammic Pakistan would serve US interests far better.Moreover Pakistan was close to Iran,the then centrepiece of US middle east policy.So the US supplied a submarine & F-104 starfighters to the Pakis & along with the Brits,denied the same stuff to India.At the same time,the Soviets invited the Indian armed forces to look at their weaponry & were very liberal in showing the Indians around.The 1965 India-Pak war(where Pakistan ,flush with US supplied weaponry launched a pre-emptive strike on India) & the coming to power of Indira Gandhi in 1967,firmly put India on the Soviet course.
But the Pakis being your allies,I have no qualms with that-but don't forget they are the world's largest nuke proliferators & along with their Saudi buddies,helped lay the seeds for Al-Qaeda & the Taliban-a pretty trustworthy ally,right??
Bout India's stance on Taiwan,I think Ive told you earlier,that it would depend on the state of Indo-US & US-Pak ties.Besides,I hope you know where US allies like Australia,Great Britain,Singapore & even South Korea stand on Taiwan-all of them are behind Beijing & are averse to participating in clash on the straits.