This is part of the reason that the US wants China as an ally, not an enemy. Aside from the market potential of those millions switching from a cash economy to a credit economy (thus spending lots of future income right this minute, before it moves from "receivables" to "deposits"), in the event of an altercation with North Korea, how better to deal with a pit bull than with the owner?
See Christian Science Monitor article.
A Pentagon report last year detected Chinese ambitions to build a fleet capable of protecting the sea lanes that carry the country's vital oil imports through the Straits of Malacca, and of operating even farther afield, in the Indian Ocean.
China's growing political and economic interests, especially its worldwide appetite for imported raw materials, mean that it sees defending those interests in ever broader terms, says Dr. Roy.
"As such a big country, with an ever more global outlook, what China needs to do to defend its national interests will inevitably impinge on the interests of other countries," Roy predicts, and "it will demand a degree of diplomatic skill" to assuage neighbors' suspicions of Chinese intentions, he adds.