FT story a while back, noting that Chinese internal security spending now bigger - at least officially - than defense. Of course, both numbers are probably underreported, just equally so.
Source was new budget released by China, saying public security will now cost 624B RMB and defense 602B RMB.
In the US federal budget, I would say defense outweighs "security" by more than 2-1.
You want to know why China can never be a true superpower without being democratic? Good example, there.