[Chad Fairbanks]

And here's a photo I found...

A Chinese policeman stands guard on May 13 behind newly installed barbed wire outside Canada's embassy in Beijing, where two North Koreans sought asylum. REUTERS/Guang Niu

[piasa]

I guess china figured it better cover the embassies in barbed wire before half their population gets ideas from the North Koreans... that's something some Chinese policemen really couldn't stop.