Notice to Airmen (NOTAM) issued:

PIA flights to & from Kuala Lumpur began using Chinese airspace instead of Indian airspace from April 27.

Source: flightradar24.com
Earlier, Pakistan made its airspace unavailable for Indian aircraft through following NOTAM issued on April 24.
From April 24 to May 23, Pakistan airspace not available for Indian registered aircraft and aircraft operated/owned or leased by Indian airlines/operators including military flights.
Notice to Airmen (NOTAM) issued:

Abbas