Not trying to defend whether Pakistan can defend themselves from Brahmos. I am only stating that the Brahmos is not all powerful and can easily be shot down with ESSM. And as far as a link to the statement. Simply click on the statement which is a link. or if that's to hard I guess here click on this
RIM-162 ESSM - Wikipedia, the free encyclopedia
Does Pakistan currently have these weapons....No! but they are obtainable. Unless of course India is planning on attacking Pakistan at anytime. Also there is a high likely hood that the Frigates the U.S. is providing Pakistan with starting this year. Will have it as part of the 65 million dollar upgrade for each ship. I will have to do some research on what land based missiles are effective against Brahmos.
And who cares if Pakistan (or any country) pays cash for Missile Frigates or if another country gives it to them. The bottom line is they will not go to waste in a naval bone yard.
Also your belief that the U.S. would not allow Pakistan to have ESSM simply becuase of China won't hold up. The U.S. and Russia both sell advanced weapons to countries that are marginal allies. Look at Russia who is getting ready to sell the S400 to Saudi Arabia. Or look at Israel who we know takes our technology we give them. And sells it to other countries like China and even India. Heck we even offered India the F-35 even though you have a strong relationship with Russia.