Tell the nuclear powers to stop boycotting multilateral efforts and to attend the World Summit on Nuclear Disarmament

Establishing a nuclear-weapon-free world requires international cooperation. As the first-ever world summit on nuclear disarmament, the 26 September High-Level Meeting on Nuclear Disarmament could be the beginning of the end of the nuclear threat.
But the nuclear-weapons states -- China, France, Russia, UK, and USA -- have already this year collectively decided not to attend the two other major multilateral events regarding nuclear weapons: the March meeting in Oslo on the Human Impact of Nuclear Weapons and the May Geneva meetings of the Open-Ended Working Group, which has a mandate from the UN General Assembly to "develop proposals to take forward multilateral negotiations on the achievement and maintenance of a world without nuclear weapons." Will these countries be represented at the highest level on 26 September at the General Assembly? Or will another collective decision be made, this time to send low level officials?
Their refusal to cooperate will be used as an excuse by other leaders not to cooperate with global nonproliferation efforts. A willingness to cooperate would inspire other leaders to help hold the line against proliferation, while negotiations proceed to prohibit and eliminate all nuclear weapons.
This petition could tip the balance.