China at the United Nations officially blocked the long- pending move of the US, France and Britain to designate Azhar as a terrorist by the UN Security Council. Last year, China had done the same to stall India's application before the same Committee.
China has often asked India to discuss Masood's issue directly with Pakistan.
"India strongly believes that double standards and selective approaches will only undermine the worldwide community's resolve to combat terrorist".
China had, earlier, indicated it would block India's request at the Security Council.
According to United Nations rules, if China does not extend the technical hold, Azhar would automatically be designated a global terrorist.
The Chinese Foreign Ministry had indicated on Monday that it will block the U.S. resolution. A second three-month hold was placed in August under the committee's rules that allow members to seek more information.
Previous year in March, China was the only member in the 15-nation UN organ to put a hold on India's application with all other 14 members of the council supporting New Delhi's bid to place Azhar on the 1267 sanctions list that would subject him to an assets freeze and travel ban.
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"We believe that the Committee should follow the principles of objectivity, professionalism and fairness and reach a decision by a consensus based on solid proof", he added.
"We are deeply disappointed that once again, a single country has blocked worldwide consensus on the designation of an acknowledged terrorist and leader of UN-designated terrorist organization, Masood Azhar", Kumar said in a statement that did not name China.
The Indian statement did not identify China, a close ally of Pakistan, as the "single country".
The blocking by China comes barely two months after Beijing agreed to name the outfit a terrorist groups at the BRICS declaration.
"For the first time you would notice, there has been such specific listing of such terror organisations and the fact that BRICS countries should work together in facilitating listing of these under UNSC", said MEA secretary (East) Preeti Saran in Xiamen on Sep 4. The Jaish-e-Mohammed chief operates freely within Pakistan and the group is believed to have close ties to the Pakistani security establishment.
That was, however, not the first time that the LeT and JeM have been named as terror groups in a multilateral document endorsed by China.