On 4-5 February, 2015 the P5 or Nuclear Non-Proliferation Treaty Nuclear-Weapon States, comprised of China, France, the Russian Federation, the United Kingdom, and the United States met in London for the sixth P5 conference in order to discuss the next steps for the P5 Process as well as review progress towards their 2010 NPT commitments. Paragraph 7 of the joint statement of the meeting deals directly with the CTBT.
“7. The P5 discussed efforts to achieve entry into force of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) and recalled their commitment in the 2010 NPT Review Conference Final Document to promote and take concrete steps towards early entry into force of the CTBT and its universalization. They called upon all states to uphold national moratoria on conducting any nuclear explosion. It was noted that all members of the P5 have such a voluntary moratorium in place. P5 collaboration on improving and maintaining the International Monitoring System was reviewed. The P5 intend to release a joint statement on minimizing the impact of medical isotope production on the International Monitoring System. Further, particular note was made of the successful completion of the Integrated Field Exercise 2014 in Jordan, to which all members of the P5 contributed equipment, personnel and effort. The P5 decided to continue regular technical meetings aimed at enhancing the verification regime and to hold a workshop on data quality objectives for radionuclide measurements for on-site inspections.”