The AP has a long and sad story out, Pakistani Christian girls trafficked to China as brides. One must be careful of sensational stories that hit a lot of our emotional buttons, but it seems deeply reported, and names names.
Because of the surplus of men in China, there has been a recent tendency of “importing” girls and women from poorer East Asian countries. A milder form of this has occurred in South Korea, and earlier Japan. Generally, the men and families who have to make recourse to this are poorer and less attractive on the Chinese marriage market. Some of the same has occurred, to a lesser extent, in South Asia, with Punjabi farmers obtaining wives from eastern India and Bangladesh.
The fact that Chinese men are seeking wives from Pakistan is probably a function of the reality that Vietnam is getting too prosperous, and Laos is not particularly populous (I don’t know the situation in North Korea, though with the nationalistic nature of that regime I don’t see that as being a sustainable option). And obviously, Pakistan’s alliance with China matters a great deal.
The fact that these are poor Christian women helps as well. To be frank, I suspect that the Pakistani elite does not see their traffic as a matter of honor due to a lack of identification for reasons of class and religion. Additionally, it is far more plausible for a Chinese groom to contend that they are converts to Christianity than they are converts to Islam (there are much stronger cultural conflicts between being Han and Muslim than being Han and Christian).
With 1.4 billion people, it is hard for Chinese matters not to impact its neighbors…