They won't because US and Saudi will apply sanctions.
The reason they attacked because they knew Pakistan was positioning itself as a net security provider to the middle east.
They knew formal alliances were being discussed. The attack was just after the minerals conference in Islamabad where the US was a very keen investor.
Crossing the IB to attack another nuclear power is a very brazen attack, it is actually quite retarded, Indians were desperate and underestimated Chinese technology.
Pakistan imposed a 200km no fly zone within Indian territory within the first 6 hours of the war.