Russia has cut the supply of AL-31F engines to China. So all the J-11B, 11Bs and J-15 fighters are equipped with indigenous WS-10A engines. There have been over 70 J-11B fighters produced since 2008 but none of them had a proper engine installed (this was published in official news with photos). They are being gradually released to PLAAF since January, 2010. By the end of this year China will have over 100 J-11B fighters in service. J-11B is expected soon to play simulating exercises with J-10As in air combat.
I don't think China is going to sell J-11B to Pakistan because of China-Russia relationship and the deals on Su-27 tot.
I don't think China is going to sell J-11B to Pakistan because of China-Russia relationship and the deals on Su-27 tot.