The new rules are part of a broader push to tighten airspace security, with limited exemptions for emergency, research, industrial and other authorised operations.

Chinese Foreign Minister Wang Yi begins a three-day visit to India, his first in more than three years.

Such "politically motivated and discriminatory" practice will only further undermine its international image and national credibility, says Foreign Ministry spokeswoman Mao Ning.

The Games will be held from Feb 7 to Feb 14.

The two neighbouring countries pledge to improve bilateral relations, address border question in a meeting of senior officials in Beijing on Wednesday.

Ophthalmologist Kong Qingjian has about 40 years of experience in ophthalmology, specialising in diagnosing and treating cataracts, glaucoma, myopia prevention and control and amblyopia.