Job ads: New citizens only?

How come so many job ads in the Chinese newspaper specifying new citizens only or foreigners only?

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Leong Sze Hian

About the Author

Leong
Leong Sze Hian has served as the president of 4 professional bodies, honorary consul of 2 countries, an alumnus of Harvard University, authored 4 books, quoted over 1500 times in the media , has been a radio talkshow host, a newspaper daily columnist, Wharton Fellow, SEACeM Fellow, columnist for theonlinecitizen and Malaysiakini, executive producer of Ilo Ilo (40 international awards), Hotel Mumbai (associate producer), invited to speak more than 200 times in about 40 countries, CIFA advisory board member, founding advisor to the Financial Planning Associations of 2 countries. He has 3 Masters, 2 Bachelors degrees and 13 professional  qualifications.