The correct answer to this open question is the following.
Although there are no options attached we can say the following.
Many people have been discussing the prospect of reducing nuclear arsenals across the world, but not everyone agrees.
The role the United States should play in nuclear disarmament is the role of the leader that promotes peace agreements between the powerful military nations. Otherwise, it is going to be difficult for other nations to take the initiative to do so.
Of course, for security reasons, the US has to proceed with caution in these uncertain times where negotiations are difficult and countries such as Iran have invested too much in nuclear weapons, as well as the case of North Korea.
Regarding Russia, the tensions between the United Nations and Russia make it difficult at this moment to foresee a possible agreement.
Today, there are some considerable efforts to reducing nuclear weapons. I am talking about treaties such as the Treaty of the Non-Proliferation of Nuclear Weapons (NPT) or the Comprehensive Nuclear-Test-Ban Treaty (CTBT). However, not all countries are honoring their former commitments regarding the production and testing of nuclear weapons.