Pakistan is suspending all trade between the two countries.
It also recalling its high commissioner (the equivalent of an ambassador) from the Indian capital Delhi and expelling his Indian counterpart from Islamabad.
Prime Minister Imran Khan has "directed that all diplomatic channels be activated to expose brutal Indian racist regime, design and human rights violations", a Pakistani government statement said.
He also directed the armed forces to remain vigilant.
In addition, Pakistan is asking the UN Security Council to consider the dispute.
Neighbouring China has also voiced opposition to the Indian move, describing it as "unacceptable".
https://www.bbc.co.uk/news/world-us-canada-49261795
Now the airspace as well please. No more ties on any basis whatsoever.