President Obama Sets New Limits on US Nuclear Policy
President Obama is revising the nuclear strategy of the United States, substantially limiting the conditions under which the US would use nuclear weapons.
The most controversial part of the new strategy: Obama is committing not to use nuclear weapons against nonnuclear states that comply with the Nuclear Nonproliferation Treaty, even if they attack the US with biological or chemical weapons: Obama Limits When U.S. Would Use Nuclear Arms.
However, please note that the new policy leaves intact the first-strike strategy, contains “exceptions” for nations like Iran and North Korea, and reserves the option to reconsider nuclear retaliation against a biological or chemical attack.