China won't do shit. India has 127 Billion dollars trade with China. At worst, China can lend some indirect support which won't be new. Furthermore, because of QUAD and US activism, China hands are tied. Russia won't back them either due to ongoing engagement in Ukraine and good ties with India.
As far as India attack on Pakistan is concerned, then 26 people were killed in a terrorist attack.
And, then their Defence Minister, openly admits to Sky News that they had been training Terrorists.
https://youtube.com/shorts/s6WvvvPoRZ8?si=hR00cHPg7Xd57Jcc
Do you realize what 3 decades of training, arming and radicalizing youths can do? Do you realize the sheer numbers of these radicalized youths ready to do terror attacks?
India only attacked "terrorist infrastructures" last night. No further plans.
Pakistan with already crashing economy can't afford war with India. At worst, Pakistan would try to do something similar under political pressure but on minimal scale to show citizens that they acted.
And, if they are insane enough to go beyond it... Fitting response would come .