In the event of war Chinese will be using it on us, that matters a lot i guess .Russia selling something to China will not be exclusively used by China against India. That's not the case with Pakistan.
And we need a weak Pakistan (an extremely weak one) to allow us the space to do something in Tibet.
Every alm given by US to Pakistan, cuts into that space of ours.
I need a strong india over Pakistan & china.
China will also do the same.