Global geo Politics change all the time, today's enemy might become friend in the future. Russia get closed to PaKistan for its presence in Afganistan and cut weapon market. There is no personal emotion in country relationship. Think this scenario, if India break apart someday in the future, without the pressure of india,will Pakistan be able to keep good relationship with china ever after. India member should not dismayed by Improvement regarding to Russia and Pakistan in terms of defense cooperation. What Indian member focused is whether enhancement of defense cooperation will dampen India defence security as Russia might sell sensitve technology to Pakistan.
Ps: china and Vietnam are brothers in 1960s. when soviet union stirred the relationship after Vietnam reunification, viets choosed to stand for Soviet and turned hostile toward china. I wish that tragedy never happen again. Wish God bless us! I'm here to deliver my concern, and sorry if any potential emotional infraction. Both China and Pakistan should take experience of the historical event for future pavement.
What you able to do is according to where you stand. China will always treat our truly brother with strong support! We never sell weapons to India while we selling Pakistan, that's the difference between China and Russia. Everybody See? Nowadays, China made weapon is no more inferior to the Russuan ones.