The member countries of the six-way nuclear talks will seek to adopt on Wednesday a verification protocol for North Korea’s declared nuclear programs and materials.

Earlier on Tuesday, China, the host of the talks, reportedly unveiled a draft of a verification protocol and is likely to submit on Wednesday a revised draft that reflects the position of all participating countries.

If all member nations agree to the revised draft, the six-nation talks will likely conclude on Wednesday. However, the possibility of the talks being extended also cannot be ruled out in the event participating countries fail to narrow differences on contentious issues.

China’s draft reportedly includes the subject and method of nuclear verification, a related timetable and a determination of which nation will head related efforts. The draft is said to be based on a previous six-nation agreement adopted earlier in July and a U.S.-North Korea accord adopted in October.

A source familiar with the talks said the questions of who will lead the verification efforts and what role the International Atomic Energy Agency will play in the matter are key issues. The source added that the issue of access to undeclared nuclear facilities is also a contentious matter.