Indian internet connections to servers in China appear to have been cut with no ability for Indian web users to access websites hosted in China.
The breach also appears to have affected corporate email with Indian employees are unable to connect to their colleagues and friends in China. Users in India have had to use services based overseas like Gmail to connect to China
This disruption could have been caused by a host of reasons.
However, before a true shooting war begins, one of the first things one sees is a cutting off of communications.