The proposal to designate Azhar under the 1267 Al Qaeda Sanctions Committee of the UN Security Council was moved by France, UK and US on February 27. The Al Qaeda Sanctions Committee members had 10 working days to raise any objections to the proposal. Just before the deadline was to expire, China put a "technical hold" on the proposal.

from Times of India https://timesofindia.indiatimes.com/india/china-again-blocks-bid-at-un-to-list-masood-azhar-as-global-terrorist/articleshow/68400238.cms