China is offering its citizens cash rewards of up to and above 100,000 yuan ($15,000) for tip-offs about people who endanger national security, as authorities intensify a years-long campaign to weed out what they see as growing threats from foreign espionage and “hostile forces.”China is offering its citizens cash rewards of up to and above 100,000 yuan ($15,000) for tip-offs about people who endanger national security, as authorities intensify a years-long campaign to weed out what they see as growing threats from foreign espionage and “hostile forces.”