George Bush was the first American president to unilaterally dismantle some US nuclear weapons. In 1991, he committed the U. S. to the destruction of some chemical weapons.
no
Russia is the main country helping to get north Korea to dismantle its nuke weapons programs
Truman was the only president to authorize nuclear weapons usage. It ended WW2.
Truman
Harry Truman
In the US, the President with his "football".
Several- but notably, Ronald Reagan.
President Kennedy saw US nuclear weapons as a tool of deterrence against Russian aggression and necessary for securing mutually assured destruction.
the president is allowed too
Harry S. Truman.
Yes s/he can. The President is at the top of the National Command Authority which controls the release and execution of Nuclear Control Orders.