CHINA is a third Party for the Land Control .. the Population in the Region controlled by them is not Significant ...
if India / Pakistan Agree to Plebiscite, they can do so !
I disagree ... the UN Resolutions are binding on ALL Parties until unless the said resolution is bring to the close....
Following is UN Standpoint on UNMOGIP .. U can Find it one there website
Please google search "UN mission for kashmir" (i m unable to post links)
"""In July 1972, India and Pakistan signed an agreement defining a Line of Control in Kashmir which, with minor deviations, followed the same course as the ceasefire line established by the Karachi Agreement in 1949. India took the position that the mandate of UNMOGIP had lapsed, since it related specifically to the ceasefire line under the Karachi Agreement. Pakistan, however, did not accept this position.
Given the disagreement between the two parties over
UNMOGIP's mandate and functions, the Secretary-General's position has been that UNMOGIP could be terminated only by a decision of the Security Council. In the absence of such an agreement, UNMOGIP has been maintained with the same arrangements as established following December 1971 ceasefire. The tasks of UNMOGIP have been to observe, to the extent possible, developments pertaining to the strict observance of the ceasefire of 17 December 1971 and to report thereon to the Secretary-General.
The military authorities of Pakistan have continued to lodge complaints with UNMOGIP about ceasefire violations. The military authorities of India have lodged no complaints since January 1972 and have restricted the activities of the UN observers on the Indian side of the Line of Control. They have, however, continued to provide accommodation, transport and other facilities to UNMOGIP."""