Keep an eye on diplomatic and trade agreements China has made in the past few years in South and Central America. They know we have weak borders and even weaker "friends" to the North and South.
China is developing a long-range strategic objective of trade engagements in our hemisphere. From there, it's just a short step to selling military systems and the advisors to train their Latin hosts how to use them.
It's not a far stretch to imagine (in 20 years or so) Mexico cooperating with China in order to gain back their beloved "Maztlan" from the American Southwest.
GW
Mexico is already getting "AZTLAN" back through RECONQUISTA.
A very believable scenario.